Hello, Ronnie, suggest you check the turntable motor rubber grommets, they perish after about 20 years. The motor drops, and the idler runs on the top 33-1/3 step of the motor shaft, instead of the lower 45 step! New ones are less than £1 each. Selection, clean the printed track both sides of the selector plate. Be VERY careful of the wipers, they have been known to go brittle with age and break off ! Use IPA or switch cleaner, NOT WD40! If well tarnished, use Brasso or Dura-glit, then IPA.
John, Bristol.