I have the 42H82 and I put my centre channel on the top and I think it started to bow. I took it off for a couple weeks and pulled up on the beveal trying to let it go back into place but there are three black marks still at the top of my film screen. I think its due to bowing but not sure. Anyone know why these are there or had anything similar happen. How could I get rid of them. I would take apart the screen but i would like to avoid doing that. Thanks!