Apple will return you your 49 bucks if they detect a hardware problem. Obviously, as you see on the Apple forums, it is the case.

Do not hesitate to ask for a midplane (the motherboard and related stuff): they can send you the replacement stuff (!! upt to two months of delay - they ran out of replacement parts) and you can do the operation: see manuals:
here

Do not hesitate to ask to discuss with the customer support; be quiet but firm and explains it is not normal for a computer (whatever its design is) of less than one year to have security shutdowns because of overheating

Good luck
Phil