The rear fan of my early 2009 Mac Pro is making an irritating noise (the fan that is in the same level as the CPU). A replament part with the installation work would cost approximately 200 euros which I think is a bit much. I'm thinking of getting the part and installing it myself. I already tried unplugging the fan. I found the tab that attaches the fan to the aluminum chassis above it. Some force would have been required so I was afraid to proceed with just my gut feel. Could anybody give advice how that fan is safely removed? Does the 5.1 MP have the same fan?