2009 135 rag top black
external mirror pass side is appears brown at bottom center of mirror assembly almost looks like a line from bottom center towards the left inside corner, a heated mirror assembly. Has anyone else experienced this , just waiting for it to explode or kill the battery some day. I suspect the replacement would Brake My Wallet. Any thoughts ?

Love the car picked up about three years ago 33k now has 105k (Too bad its and automatic)
Thanks