[Jukebox-list] Wurlitzer 3800 selection button issue

When making selections on Wurlitzer 3800, buttons A thru V and all the number buttons 1 thru 0 have become really hard to push in. Many of the buttons when pushed make unusual noises. It just feels like they need some lubrication. Over the years, I remember many discussion group members saying not to use WD-40. Any suggestions on how to loosen these up and make them work much smoother?

Thanks in advance. John F.