My left fan is making a little noise while spinning. I think it is either the dust or it is getting old... iFixit and PowerBookMedic sell it respectively $49.95 and $59.95. Both are manufactured by Delta electronics. I checked eBay and found a replacement part (model MagLev MG62090V1-Q030-S99) much cheaper (less than $20), and it is manufactured by Sunon. I couldn't find any information regarding the noise, though. Anyone had experience with this fan model? Would I expect the same quality as the Delta model? TIA.