We have a PS6100 that recently started throwing 28.4.7/28.4.8/28.4.9 errors that specify that the "Control module chipset/processor/SAS controller sensor temperature of 0C is below the critical threshold of 5C."  These errors started shortly after replacing a model 70-0400 controller card in slot 0 from a third party warranty service (Dell support is of course long ago expired).  The event log shows that the error clears roughly thirty seconds later.

Any thoughts?