I had a SCD-1 years ago, it started to have read errors. I think I talked to Richard Kern about cleaning the sled assembly. I did my own disassembly, cleaning with a lint free cloth and solvent (brake cleaner) and lubed the assembly with a light Teflon oil I got from Radio Shack called Needle-Tip Precision Lubricator, there are probably other brands out there (Super Lube). As mentioned before in this thread, over time the parts get sticky and cant slide freely. I didn't do anything with the motor and DeOxit but that sounds like a good idea while youre at it. I am not a stereo gear mechanic and I don't remember if I had a manual but got through it without any issues and my player ran fine after the clean and lube.
Good luck,
Mike
Good luck,
Mike