Can an iPhone 4S back panel be used as an iPhone 4 CDMA back panel?

would there be a way to replace the screen on the non-retina MBP for a retina display?

Depending on the version on Android T-Mobile has released a Software/Firmware update that may fix the problem. When I can i will post a link to the .zip file for the 2.3.X update if you do not have it already.

Before cleaning it, try resetting the SMU. heres a step-by step guide http://support.apple.com/kb/HT1436

There's an app called smc fan control it should give you a reading on how hot the cpu is. If you it is that you could open up the case and try to use compressed air to clean up out some dust, and I or makes the fans run at a higher speed by increasing the rpm speed in the app.