I agree. There is no preventative maintenance on that machine. The best thing you can do to ensure a long life is to run it a few times a week. If it gets to the point where it stops mounting the disc correctly then that will probably be the belt being all stretched out.
The absolute best way to break a 90s player:
1) don’t run it for 16 years
2) mail it to someone
Just don’t do either of those things.
(80s players are orders of magnitude more robust in most situations than 90s players)