just bought a 50" 75u from Sound Advice aka Tweeter. Looks great, but I just noticed on the bottom right, there is either dust or small scratch on the inside of the glass. If it's dust, could it potentially move to the center or anywhere else on the screen? It was sort of a hassle to bring home. I had to borrow a friends truck and all. Should I exchange it? I've attached a photo. Any input would be appreciated.