My friend has bought a new Macbook Pro, in England.

He has started to have a problems with overheating.

Both I and him live in Russia, where no Apple stores are situated,

and we are not going to visit Europe anytime soon (before the 1-year warranty expires)

So, I am going to fix it myself, because I am quite skilled at this field.

I am going to replace the standard Apple thermal grease.

(check the Step 10: Holy thermal paste )

I have a Coollaboratory Liquid Ultra, one of the best thermal interfaces available:

http://www.coollaboratory.com/en/produkt...

The only problem is that it is prohibited to use it if the part of the cooling system

which comes in a direct contact with thermal interface and CPU/GPU

is made of aluminum.

So, please, tell me, what the part of the cooling system,

which comes in a direct contact with thermal interface and CPU/GPU,

is made of?

According to this photo, CPU's and GPU's heat sinks are made of copper (because of specific color)

http://img600.imageshack.us/img600/6162/...

but I still don't know about the third heat sink (for Thunderbolt controller):

http://img826.imageshack.us/img826/5995/...

Don't see the surface of material:

http://img153.imageshack.us/img153/9814/...