Left and right fans running at different very different speeds on a 15" i5 Macbook Pro

I have a MacBook Pro i5 and it seems to be heating up a bit more than the first couple of months I had it.  I also have istat which shows my left fan at around ~250 rpm's.  The right fan is running at around ~2500 to 3500 rpm's.  Is this normal or is this something I should take in to a genius bar to take a look at?
The temps of the CPU run from about 50 to 80.  Any help or gudance is appreciated.

250 seems to me to indicate an issue - not sure if I have seen ANY computer fan purposely running at that speed - could be the fan or the sensor that monitors the fan is faulty. If high temps are being seen then faulty fan could lead to more serious issues.

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