NB fan needs replaced

My NB fan is starting to make a pulsing, annoying noise. The rpm shows around 3000 which is a bit low and i don't exactly have a can of air at the moment and it doesn't look like there is any dust in it. Btw, its the old style. Should i send it back and get a replacement or should i replace it with a zalman which would probably voide the warrenty. This seems to me like a really good way to get a new mobo.

Get the Zalman Northbride Cooler (the blue one).
Dont bother replacing the fan. Because in 3 to 6 months your probably just gonna be replacing the fan again. Put the Zalman on it and it eliminates the problem altogether.