There is a clicking sound coming from my GPU fan, a Sapphire 5850 Vapor-X. I have confirmed it is that fan, and not another fan. There are no wires or other things touching the fan, and I do not believe there is a bent blade (I've only had this card for 6 months, and I doubt compressed air damaged the blade). Upon research, it is suggested I try lubing the bearings. How would I go about this, if this is the correct action to take?