I think what he's suggessting is that you have a microfracture problem with solder joints on the board somewhere there and that baking the board in the oven for a short time might fix it. sounds plausible to me just need to keep the temp low and duration short obviously.

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That's what I thought but would like a little more info about bake temp and duration, if available.

Also, I'm told that by replacing the MB I would need to calibrate the fans or they would run at full speed. Can anyone confirm this, and if true, point me to the calibration software. I have not been able to find anything relevant on Apple's site or on InfoMac.