How to tell when a drive dropped out of a RAID array on PERC4 controller

I have an old PowerEdge 2800 server which has a RAID5 array originally configured with 3 drives.  2 of the drives have dropped out of the array and the array is now down.  Recent backups have all failed.  It is likely that 1 drive dropped out weeks or months ago, however the 2nd drive definitely dropped out in the last week.  I would like to identify which drive that is and force it online in an attempt to get the array online, if even only for a short time to recover the data.  Unfortunately the RAID management software was never installed, so there is no software log to go through to try to figure out which drive dropped out last.  Is there any other way I can identify which drive dropped out when?  Thank you in advance.