Expansion bay fan too fast/loud

My dual 2.7 G5 has recently developed a problem with the expansion bay fan. As soon as the boot process has reached a certain point the fan goes to about 90% speed and stays there.
Resetting PRAM, SMU, repairing permissions, updating the system (10.4.8 all updates installed), nothing helped.
TechTool Deluxe shows no problem.
Hardwaremonitor 4.0 shows 89-90% fan speed for the PCI Expansion bay. But there is only the graphics board installed and I did not change anything about the configuration since I bought the machine. Hardwaremonitor shows about 58000 for the power use in the expansion bay (whatever unit it may use here...). Is that a normal figure?
Everything else is just fine, but as soon as the system starts running it decides to drive the fan to that uncomfortable speed while a few weeks ago the whole Mac was barely making any noise at all.

Hi Guido, and a Warm Welcome to the Power Mac G5 Forum!
Assuming that you have made a visual (and aural (!)) check that it is definitely the fan at the front of the G5, in a combined housing with the puny internal speaker, that is making all the noise -
The units for "Slot combined" (as it's called on this venerable G5 DP2 running HM v. 4.1) are mentioned in the HM Help FAQ
"Why do the power sensors of the Power Mac G5 slots not carry a unit?
At this time we don't have enough data about these sensors. For this reason it is unknown in which unit the readings have to be interpreted. The readings could, for example, be interpreted as milliwatts. The sensors Slot 12V, Slot 3.3V and Slot 5V show the power load drawn by PCI cards for the respective voltages. The sensor Slot combined also includes the current power load by the SATA hard disks."
The "Slot combined" on this G5 DP2 with an X800XT is reading 23563.0; note that, according to the quote above, this also includes power to the hard drives.
This "PCI Slot Fan" is currently showing 35%.
For comparison, there are some fairly, er, not-very-recent, HM readings here
http://macosg.com/group/viewtopic.php?t=1314&start=0
As you have already run TechTool
https://support.apple.com/techtooldeluxe/main?id=dl
You could try the Apple Hardware Test
http://www.thexlab.com/faqs/aht.html
Sometimes re-installing the combo updater fixes this type of problem
http://www.apple.com/support/downloads/macosx1048comboupdateppc.html
Other than that, you could try calling AppleCare.
However, investigations are ongoing...

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