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Dell CPU Sensor error?

Have a Dell Poweredge 2800 that randomly reboots.

Running Server 2003 R2 with 1 CPU and 2 GB Ram.  No suspicious events in the Windows event logs.

The OpenManage Embedded System Management Log has several of these errors:
PROC_1 Status processor sensor IERR
PROC_1 Status processor sensor recovered from IERR

All other components are healthy.

Bios, BCM and Backplane firmware are already up to date.

Tried re-seating the CPU and applying new thermal grease, ran Memtest and Dell offline diagnostics - all pass.

Any ideas?

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