https://www.change.org/p/timothy-d-cook-replace-or-fix-all-2...
It's ludicrous that to attempt to fix this problem, you would have to go so far as to bake your laptop.
It cost me over $US 500 to get this fixed at an Apple Store.
When a friend was buying her mother a christmas present iPad, I went with her to examine which models handle the tablet workload better. We ended up picking an older generation, non-retina model. A few previous generation retina models, presumably running latest iOS updates, had ridiculously high temperatures just idling on the shelf.
It's not a BGA solder issue like we've seen on numerous laptop GPUs over the years, but a problem with the internal interconnects. Heating it, as if to reflow a BGA does temporarily solve the problem, but in my experience, the period of time it keeps working after heating gets shorter each time.
[0] http://www.tomshardware.com/news/nvidia-g84-g86-chips-overhe...