I was actually a little worried about this and tried a hair dryer on high heat for about 10 minutes over the GPU. It also worked like a charm. Make sure to let it cool down for at least 15-20 minutes after doing this. The one advantage of doing it this way over the oven is that you dont have to completely remove the motherboard from the case. Just remove the cover from the bottom and point the hair dryer directly at the GPU. Let it cool down. Put the cover back on. Start MBP back up.
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I was actually a little worried about this and tried a hair dryer on high heat for about 10 minutes over the GPU. It also worked like a charm. Make sure to let it cool down for at least 15-20 minutes after doing this. The one advantage of doing it this way over the oven is that you dont have to completely remove the motherboard from the case. Just remove the cover from the bottom and point the hair dryer directly at the GPU. Let it cool down. Put the cover back on. Start MBP back up.