Mac Pro overheating; can I replace the power unit fan?

After much strange behavior with my MacPro2,1 model I installed Hardware Monitor and discovered that the temperature readings for some of my Memory Modules and for the sensors on the Power Supply location 1 and Power Supply location 2 are very high. With no load the temperature is reading about 62° C on the "Power Supply Location 1" sensor and 85-90° on "Power Supply Location 2" sensor. I installed smcFanControl and found that I could cool the Memory Modules but even with all fans set on maximum speed the Power Supply temperatures droped only slightly to about 78- 80° C. All of the fans increased their RPM except for the "Power Supply Fan" which remains at 599 RPM no matter how high you set the Power Supply fan on smcFanControl.
All this leads me to suspect that the Power Supply Fan is either not running at all or is not able to accelerate in response to high temperatures in the power supply area.
My questions are these:
    1. Can I visually confirm that the power unit fan is not working? That is, what do I need to do to actually visualize this fan in question and see if it is running? Is there another way to confirm that the fan is bad aside from just inferrring this from the high temperatures and findings in smcFanControl?
    2. Is fan replacement a job that I could reasonably expect to perform myself or do I need to take it to an Apple repair shop? I have replaced hard drives and RAM in Powerbooks and a Mac Mini, installed PCI cards, etc.
    3. Are there diagrams and/or instructions for doing this sort of thing?
Thanks.
John Baughman

John Baughman wrote:
... 1. Can I visually confirm that the power unit fan is not working? That is, what do I need to do to actually visualize this fan in question and see if it is running? Is there another way to confirm that the fan is bad aside from just inferrring this from the high temperatures and findings in smcFanControl?
    2. Is fan replacement a job that I could reasonably expect to perform myself or do I need to take it to an Apple repair shop? I have replaced hard drives and RAM in Powerbooks and a Mac Mini, installed PCI cards, etc.
    3. Are there diagrams and/or instructions for doing this sort of thing?...
If you only have one DVD drive, you can shine a bright light straight back through the lower drive area where you'll see a screen with fan blades behind it at the rear end of the SuperDrive cage. That's the power supply fan at the front of the power supply. You should be able to see it spin when you power up. I found that smcFanControl couldn't control the PS fan on my Mac Pro 1,1 either (it does work on the 5,1's PS fan). If you remove the SuperDrive carrier, you can get directly at the PS fan for more effective dust removal.
Diagrams and instructions for how to do that and much more can be found here http://tim.id.au/laptops/apple/macpro/ which is a source of Service Manuals. X423424X gets the credit for posting that link; I just bookmarked it.

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