Excessive Fan Noise in Mac Pro (Late 2008)

Starting in October of 2009, at about one year of age, my Mac Pro started cycling through periods of excessive fan noise: the fan goes from quiet/inaudible to so loud that I cannot hear talking on the radio in the room.
Re-set the PRAM.
Re-set the SMC.
Ran HW Test (Full test) and got the following: 4sns/1/40000000:tcbh -127.500
Called Apple Support.
Re-ran Hardware Test showed no problem.
Did nothing more. Machine seemed fine.
In January of 2010, the problem returned.
Ran HW test (Full test) and got the following: 4sns/1/40000000:tcbh -127.500
Per instructions from Apple over the phone, I took the Mac Pro to a "Genius" at the local Apple Store "Genius Bar."
The "Genius" booted the Mac Pro on the store network (while I waited) and got the same error message. The "Genius" said he would order some parts and install them.
Left machine.
Received call one day later from another "Genius." He said the first "Genius" was wrong. They've been running the machine continuously with no error message at all. (BTW, he treated me like an idiot, though he clearly didn't have all the facts in the store's own record about the machine. Typical 20-something IT kid.) After some argument, he agreed to run more tests. Received another call fro yet another "Genius" telling me the machine was OK.
I picked up the machine.
The fans continue their behavior, BUT HW test (full test) now shows NO error.
At rope's end. Clearly Apple will be of no assistance, despite the warranty I paid for.
The machine cannot be used in the same room as I as I cannot talk on the phone, etc., with the fans running so loud, which they appear to do every 30 to 60 minutes.
Any ideas?
Some thoughts:
The problems started not long after installing 10.6. Coincidence?
I am not sure, but I think the fans go nuts whenever I use iTunes or Quicktime. I have not tested this and I could be wrong, but whenever I have those programs closed, the fans seem to settle down.
If no one has any ideas, I'm thinking of selling the machine and getting something else, as it is not useful "as is."

There are reports of the new MacPros having heat issues rendering audio (QuickTime/ iTunes).
Seems to be a hardware configuration issue not a software problem.
http://forums.macrumors.com/showthread.php?t=859452
http://forums.macrumors.com/showthread.php?t=795966

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