S4810P Major Alarms problems

Hello,

How to clear alarms in S4810P? (clear alarms do not fix problem)

#show alarms                                 

--  Minor Alarms  --
Alarm Type                                        Duration
---------------------------------------------------------------------------
No minor alarms

--  Major Alarms  --
Alarm Type                                        Duration
---------------------------------------------------------------------------
PEM 1 in unit 0 down or removed                   6 day, 23 hr, 46 min

#show system

Stack MAC                  : 00:11:88:cc:22:ff
Reload-Type                         : normal-reload [Next boot : normal-reload]

--  Unit 0 --
Unit Type                  : Management Unit
Status                     : online
Next Boot                  : online
Required Type              : S4810 - 52-port GE/TE/FG (SE)
Current Type               : S4810 - 52-port GE/TE/FG (SE)
Master priority            : 0
Hardware Rev               : 3.0
Num Ports                  : 64
Up Time                    : 1 wk, 0 day, 4 hr, 46 min
Dell Networking OS Version : 9.9(0.0P1)
Jumbo Capable              : yes
POE Capable                : no
FIPS Mode                  : disabled
Burned In MAC              : 00:11:88:cc:22:ff
No Of MACs                 : 3

--  Power Supplies  --
Unit   Bay   Status       Type    FanStatus
---------------------------------------------------------------------------
  0     0    up           AC      up    
  0     1    absent               absent

--  Fan  Status  --
Unit Bay   TrayStatus  Fan0    Speed   Fan1    Speed   
------------------------------------------------------------------------------------
 0    0     up          up      6720    up      6960    
 0    1     up          up      6720    up      6960    

Speed in RPM