Didn’t Philly76 say he is having trouble with a Shuffle Inn? That’s a solid state game of the Williams system 11 variety.
Clean the roll over switches by polishing them with metal polish. Avoid filing them or using sandpaper. You might want to slide the alley out and flip it upside down for easy access. If you are fortunate enough to have the height you could flip the machine straight up in the air onto its back and pull up a chair and work comfortably. Make sure all of the fish paper insulators are intact.