PowerMac G5 Fan Speed on Overdrive - Always

I have a PowerMac G5 Dual 2.0 GHz (PPC) that has recently started to kick all the fans into overdrive upon boot. They continue to run at high speed for a long period of time (maybe 30 minutes) and then settle down. It did it once last week, and then once again this morning. The issue last week just cleared itself up (I was not present during the issue, so I have very little information on that incident). This morning, I ran the extended AHT, and it came back clean. The fans still were at high speed. Reset the PMU, fans were still at high speed. Unplugged machine for 30 minutes, fans still at high speed. Reset nvram, cleared up the problem.
The question is if this is symptomatic of a larger issue, or just something that wigged out in the nvram. I work support on a customer site, and we have approximately 25 PPC G5's; this is the first time I have seen this issue with any of them. Searching the forums have yeilded very little good information.
All covers were on correctly, the interior of the machine is dustless. I see no signs of anything out of the ordinary. It is running Mac OS 10.4.10 and has maintenance run each night.
Any ideas?
Thanks, Chris

Best bet is to take the machine to an AASP and have them run a thermal calibration for the processors.

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