Nice score!! Nothing is free anymore as you about to learn with that project.... No, WD40 or something comparable is most likely whats causing that sticky problem in the first place, Jenn would take the selector apart and clean it, (Take a lot of pics to aid reassembly) using a good quality metal polish, (don't scrub too much or you will rub the plating off) Just a good clean, As for the carrousel I would look at the service selection switch and make sure its not in scan, Then would take a good look at the selection unit. Good luck.