Powerbook fan turned on all the time?

I just had my logic board replaced and since I've had it back, the fan run constantly. All the time, non-stop. The temperature sensors read the processor temperature at ambient (24-26C) and the hard drive at 40C.
Is there a setting or something I can tweak rather than send it all the way back to apple? I lost a whole week of work when it was in repair and dread having to send it in again...

I'm not aware of any setting that will turn the fans on or off, beyond the Apple hardware test that tests if they are working. Although you're not keen on returning the machine to Apple, they mucked something up and need to make it right.
That said, you can try resetting the Power Mangement Unit by following directions at http://docs.info.apple.com/article.html?artnum=14449

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