My MacBook Pro was seriously overheating. I was rendering photos and videos at about 98ºC!
The repair when well. I opened it, took out the heatsink and used a better thermal paste (the silver one). It helped, but not as much as I had hoped. It´s around 95ºC now, but an i7 processor and 16Gb of ram might just do that! It was very good having the Magnetic Mat. There are a lot of screws in that motherboard!
If you attempt to do this, make sure you have a look at the dust of the coolers and heatsink because it may also be the problem (wasn't in my case).