I have a Denon DCD-1520 DVD player. I have had it since new. Non smoking house, We had stopped smoking pot even so not that type of issues. Any advise for skipping DVD player. It does it for the first few tracks, then 4 or 5 tracks in all is well. Have read a few suggestions off of the google world. Just looking for advice I trust with the advice I can get on this forum. I am wondering about grease type for laser guide rail lube . Cleaning fluid and any other hints. Any one know where I could find repair type manuals for Denon.