Got new 2012 six core. Set it up. Am starting to come back from vacation and so am paying more attention to how it works. Since I record audio six feet from the machine I pay attention in particular to noise. The 2012 is much, much louder than my old 2008 eight core, most of that noise coming from the exhaust fan. I've tried using fan control set at the lowest possible setting for the exhaust fan, but there's still too much noise. I'm guessing the fan is defective though it might (just) be within spec. I've read through several threads on fan replacement but am not sure I see what the options are. Anyhow, in addition to the general question "What to do?" I'm wondering whether fans are a user replaceable part such that if Apple sends me a new fan I can replace it myself? Or would they insist (probably) that I drag the machine into an Apple store for repair? The latter being a big pain in the butt and it's easier to buy a sheet of 2" open cell foam and cut it into pieces and glue them together in a makeshift enclosure... Or does anyone know of success at wiring/replacement of Apple fans with higher quality, silent fans? That would be, by far, the best option. Thoughts?