MD3000i - error with drive when status is optimal / non-preferred path

Hey,
i have a problem with md3000i in my customer.
After replacing battery in controller B amber LED in enclosure is blinking, maybe is coincidence maybe not. please notice that i replaced  already disk in slot 8 but nothing changed.

I tried change volume AE4 owner controller to preferred but it still switches to another controller (such as on the pictures).
Recovery guru still shows:

      BASIC:

         TRAY, SLOT  STATUS   CAPACITY      TYPE  CURRENT DATA RATE  PRODUCT ID                                FIRMWARE VERSION  
         0, 1        Optimal  558,912 GB    SAS   3 Gbps             ST3600057SS                               ES02              
         0, 2        Optimal  558,912 GB    SAS   3 Gbps             ST3600057SS                               ES02              
         0, 3        Optimal  558,912 GB    SAS   3 Gbps             ST3600057SS                               ES02              
         0, 4        Optimal  558,912 GB    SAS   3 Gbps             ST3600057SS                               ES02              
         0, 5        Optimal  558,912 GB    SAS   3 Gbps             ST3600057SS                               ES02              
         0, 6        Optimal  558,912 GB    SAS   3 Gbps             ST3600057SS                               ES02              
         0, 7        Optimal  558,912 GB    SAS   3 Gbps             ST3600057SS                               ES02              
         0, 8        Optimal  1 863,017 GB  SATA  3 Gbps             Hitachi HUA722020ALA330                   JKAOA3HA          
         0, 9        Optimal  1 863,017 GB  SATA  3 Gbps             Hitachi HUA722020ALA330                   JKAOA25C          
         0, 10       Optimal  1 863,017 GB  SATA  3 Gbps             Hitachi HUA722020ALA330                   JKAOA25C          
         0, 11       Optimal  1 863,017 GB  SATA  3 Gbps             Hitachi HUA722020ALA330                   JKAOA25C          
         0, 12       Optimal  1 863,017 GB  SATA  3 Gbps             Hitachi HUA722020ALA330                   JKAOA25C          
         0, 13       Optimal  1 863,017 GB  SATA  3 Gbps             Hitachi HUA722020ALA330                   JKAOA25C          
         0, 14       Optimal  1 863,017 GB  SATA  3 Gbps             Hitachi HUA722020ALA330                   JKAOA25C          
         0, 15       Optimal  1 863,017 GB  SATA  3 Gbps             Hitachi HUA722020ALA330                   JKAOA25C          

      DRIVE CHANNELS:

         TRAY, SLOT  PREFERRED CHANNEL  REDUNDANT CHANNEL            
         0, 1        1                  2                            
         0, 2        2                  1                            
         0, 3        1                  2                            
         0, 4        2                  1                            
         0, 5        1                  2                            
         0, 6        2                  1                            
         0, 7        1                  2                            
         0, 8        1                  Drive path redundancy: Lost  
         0, 9        1                  2                            
         0, 10       1                  2                            
         0, 11       1                  2                            
         0, 12       1                  2                            
         0, 13       1                  2                            
         0, 14       1                  2                            
         0, 15       1                  2 

      Drive at Tray 0, Slot 8
       

         Status:                    Optimal                                          
                                                                                     
         Mode:                      Assigned                                         
         Raw capacity:              1,819 TB                                         
         Usable capacity:           1,819 TB                                         
         World-wide identifier:     50:00:cc:a2:22:e6:d2:ba:00:00:00:00:00:00:00:00  
         Associated volume group:   AE-SATA                                          




         Drive path redundancy:  Lost                                      
         Drive type:             Serial ATA (SATA)                         
                                                                           
         Speed:                  7 200 RPM                                 
         Current data rate:      3 Gbps                                    
         Product ID:             Hitachi HUA722020ALA330                   
         Package version:        JKAOA3HA                                  
         Firmware version:       JKAOA3HA                                  
         Serial number:          JK11D1B8JSDKNZ                            
         Vendor:                 Not Available                             
         Date of manufacture:    Not Available 

      Volume name:                      AE4                                                                                               
         Volume status:                 Optimal                                          

         Capacity:                      1,465 TB                                         
         Volume world-wide identifier:  6a:4b:ad:b0:00:1b:59:a7:00:00:0c:86:53:33:54:b2  
         Subsystem ID (SSID):           7                                                
         Associated volume group:       AE-SATA                                          
         RAID level:                    6                                                
                                                                                         
         Drive type:                    Serial ATA (SATA)                                
         Tray loss protection:          No                                               
                                                                                         
         Preferred owner:               Controller in slot B                             
         Current owner:                 Controller in slot A                             


         Segment size:                                       128 KB    
         Capacity reserved for future segment size changes:  Yes       
         Maximum future segment size:                        2 048 KB  
         Modification priority:                              High      


         Read cache:                            Enabled   
         Write cache:                           Enabled   
            Write cache without batteries:      Disabled  
            Write cache with mirroring:         Enabled   
         Flush write cache after (in seconds):  10.00     
         Dynamic cache read prefetch:           Enabled   
                                                          
         Enable background media scan:          Enabled   
         Media scan with redundancy check:      Enabled   
                                                          
         Pre-Read redundancy check:             Disabled

What should i do?