CPU fan spins up for no reason and never spins down

I'm having problems with my new and otherwise immaculate iMac Intel 2.4 GHz. The CPU fan often spins up to 3500 rpm for no reason, even when left idle.
There are no processes running to justify the noise (no Spotlight indexing or anything) and the temperatures are as low as can be.
I have tried resetting PRAM and SMC many times to no avail.
Usually putting the Mac to sleep and waking it up slows the CPU fan down again, but it will go nuts at 3500 rpms sooner or later.
Once the fan has spun up to 3500 rpm it never spins down again unless the iMac is reset or put to sleep and woken up again. Even when hours of useless fan spinning has left it freezing cold.
SMCFancontrol won't help as it can't slow down fans only make them go faster.
Apple Support suggested I'd take it in for repairs but I'm reluctant as this smells like a Leopard/Boot Camp Issue from what I gathered on the boards. Also the repair service in Denmark is outsourced to third party repairers of questionable quality.
Any ideas?

I got my iMac back from repairs. They said they couldn't reproducere the error which might be as it at times appear very sporadic. The fans began to spin within the first day of use after I got it home though.
It seems that more and more users on the boards experience this problem. My theory now is that this must be a software issue as it usually begins once people update to Leopard 10.5.2.
The problem manifests itself like this:
The CPU-fan will start blowing at 3500 rpms for no reason (CPU-load and temperatures can be as low as can be.)
The CPU-fan will never slow down again by itself. Even after hours of unnecessesary spinning has left the Mac freezing cold.
Putting the iMac in sleep mode and waking it up again will temporarily slow down the CPU fan down to the usual 1200 rpms (usually for about 10 mins).
Resetting PRAM and/or NVRAM (SMC) will not help.
Installing SMCFancontrol will not help as it will only let you speed up the fans further - not slow them down.
So now I really hope Apple will address this problem with a new OS X release soon.
Still, if anyone manages to fix this problem with a hardware replacemnt please let us know.
Cheers, Jez

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