I said it before but the older the stuff the more it needs of a qualified service.
All sorts of errors like this one should be cured and the best thing to do would be a capacitor kit not in the short but long run.
I'm biased as I got my 8002 back from Dillen just yesterday. Some caps were changed among other things but the end result is a faultless Beogram and worth every penny!
Do the best thing for the Beogram and you will be happy. Get a cap kit.