Error on Fan Status on Proliant ML370 (G1)

[CA1211879]

I have a very odd problem going on with a Proliant ML370 that we have running as a 2003 DC for a remote office. The server reboots itself at least once every other day for what seems no apparent reason. The only errors we get in the event log are that the previous system shutdown was unexpected and the following about a fan thats cooling the Smart Array 5300 card:

Storage System Fan Status Change.
The COMPAQ PROLIANT 4-6E storage system connected to SCSI bus 2 of the controller in Slot 5 has a new status of 3.
(Fan status values: 1=other, 2=ok, 3=failed, 4=notInstalled, 5=degraded)


I replaced the fan over the weekend and the error went away for about a day, but now its back. Any thoughts would be greatly appreciated. Thanks!