NAD C521BEE skipping problems

Hey, is anyone still using a C521BEE?
I know mine is pretty ancient now, but I still like it 🙂
Anyway, for the last number of years it's been very jumpy when playing CD's. It is very susceptible to any movement whatsoever. I've put soft rubber feet under it but even with no movement at all it still seems to skip the odd time with perfect condition CD's.
After a quick search I see it's maybe not the most relaible CD player of all time, but it would be really interesting to know if anyone here had suffered similar problems and managed to cure it 😀
 
A lot of times there is mechanical wear of the moving parts of the optical system Sometimes those parts have to be replaced. Also, if you can find a service manual for it out on the web, there may be some useful information about servo alignment and possibly some signal checks you could do.