HP DL 360 G4 - randomly rebooting

[Jeremy Humphreys]

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One of my customers' server has 2000SP4 loaded. It is the citrix server (5 user)
The server keeps rebooting at random times. Often multiple times a day, although rarely, if ever, with no users connected.
A HP engineer has been on site - replaced memory, updated firmware and ran diagnostics (all clean) - unfortunately the server rebooted 1 hour after he left.
The machine boots with no 'pre' messages in the log, just ones telling us that it has recovered.
The latest System information agent reported [SNMP TRAP: 6025 in CPQHLTH.MIB]
I have attached the latest 2 dumpchk files.
They both report Kernal Symbols are wrong on various files.
Any suggestions ?