2011 5.0 6R80 has a buzzing/humming/clicking coming from the transmission when the key is in the off position. First noticed it two days ago after parking truck but noises stopped after short time. Today battery was weak after being parked for 8 hours at work. Did some quick googling and forum searching but couldn't find any similar situations. Before I take truck in to dealership just wondering if this has happened to anyone that can lend some knowledge. Thanks!