Yeah, still on warranty. From what I read, the heated mirrors are both on one fuse, #63, 15 A, in the main fuse box under the hood. My DS mirror still heats up, so its something else.
Got it fixed on warranty. It was the heater element in the glass. New glass fixed it. The funny thing was they took about 10 pictures of my truck and said they had to send them to Ford for approval. I guess Ford has had a lot of issues with people trying to get road-damaged mirrors replaced on warranty.