One of the door mirror heaters on my Model S (2016 pre-facelift) no longer works. There is no other fault. One of the mirror assemblies was recently replaced entirely by Tesla after it got damaged, but not the one that is misbehaving. I've looked for a fuse that might be the issue but no luck. A mirror heating element failure is very unusual. I don't think the night dimming is affected. Any ideas?
