What's the clicking noise?

I've had my MBP for about a month now and so far all has been well and good. However in the past week, I have started hearing occasional clicking noises coming from the left hand side - it almost sounds like an electrical spark. I say occasional, but it is in fact, every twenty seconds or so.
Anyone else getting this?

Just ran the hardware test and got the 4SNS/1/40000000:'TmOP' error. Is this the logic board?
Thanks for any advice..

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