So my macbook unibody is 3 years old now. My applecare expired a month back. Nowadays, it gets hot and the fans whir much sooner than they have in the past. I've removed the bottom plate and got all the dust out that I could, but there are definitely some places I can't reach unless some of the components are unhooked, which in the realm of laptops I am not comfortable doing myself. Is it possible to have my macbook disassembled and dusted at the genius bar, or is that not a common practice?