I recently acquired an old Sony 5-disc player (CDP-CE315) and it unfortunately has been skipping quite a bit. It will frequently track backwards anywhere from 30-60 seconds, sometimes at roughly the same location. This also happens when fast forwarding. I've tried different CDs and it still happens regardless. Seems to me like maybe something wrong with lens movement. I've taken the unit apart and cleaned the lens and greased what appears to be the gears that move the lens with a spray can of white lithium grease. At first it appeared to be working alright, and then the next day went back to the same problem. I would certainly appreciate any advice on how to repair this. I'd hate to toss it.