Just got a fed-2 off ebay and run a film through it, however there seem to be some scratches on it. They run horizontally all the way along the film, about a third of the way up - don't think its the lab as they've never been a problem before and the guy new the film was a test so I hope he'd have said if he thought it could be the processing. There appears to be a couple scratches and paint chips on the back plate and the film plane. Are these the cause? And what is the best way to remedy them?