I've had these problems with my former Nikon FE too, the lines sometimes turned up and sometimes weren't there, on B&W (developed by myself) and on slide film (which I do not develop myself). I've always attributed this to static electricity provoked by rewinding your film on the cassette too fast. Just rewind it slowly and see if you still get lines. If you do, I wouldn't know.(posted 9129 days ago)