Kernel panics: what does "Core FIR register check failed" mean?

I have an XServe dual G5 2.0 running Server 10.3.9 unlimited client version that began experiencing frequent kernel panics when I let it install the two most recent security updates. Before I installed those updates, the machine had been up without problems for 220 days.
It is not heavily loaded; it runs a Bugzilla via Apache2, shares some files out via SMB and AFS, and runs a jabber server with less than 20 users.
It generates entries in /Library/Logs/panic.log, but I can't make any sense out of them because they only have numeric entries in the stack traces and a bunch of register values.
I've tried a whole bunch of smallish suggestions on fixing problems with this, including repairing permissions on the disks, repairing the boot volume with Disk Utility, resetting all the NVRAM values, and resetting the PMU. Today I installed Xserve Remote Diagnostics and ran the normal, extended, and memory tests.
The memory test completes without errors. The normal and extended both get errors on the FIR. I've attached the log text from XServe Remote Diagnostics.
Is or could this FIR problem be what's causing my xserve to kernel panic? Anyone have an idea what I can do about this?
Thanks,
Frank
00:0D:93:9C:B6:E0 01/12/06 14:56:02 Testing [00000006] CPU.G5.Check FIR Registers
00:0D:93:9C:B6:E0 01/12/06 14:56:02 Bad state detected in Core FIR Register, register contents: 0x0200000000000000
00:0D:93:9C:B6:E0 01/12/06 14:56:02 Bad FIR state detected, Core: 0x02000000.00000000, L2: 0x00000000.00000000, BIU: 0x00000000.00000
000
00:0D:93:9C:B6:E0 01/12/06 14:56:02 Raw ECID data = 11c508c2c02427180411000008000000
00:0D:93:9C:B6:E0 01/12/06 14:56:02 cpuid-tdiode = 11c508c2c02427180411000008000000
00:0D:93:9C:B6:E0 01/12/06 14:56:03 Cleared all FIR sticky bits
00:0D:93:9C:B6:E0 01/12/06 14:56:03 FAILED, result:12 "Core FIR register check failed"

I see that "Panic(CPU 1): Unresponsive processor" and that makes me "feel" like it may be a hardware error.  It could be ram related.  Maybe not.
Can you run the Apple Hardware Test from your installer dvds?
Some related reading: Resolving Kernel Panics

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