I have enough games to fix. Don't know anything about the jukebox except that it plays 45s. If I had more time I would love to get my hands on one!
This could be your time.
Old 45 units have a few problems:
Grease - all the oil runs out, and all you have left is clay or paraffin (the base for the grease)
Action: Disassemble, clean out all old grease (plastic scrapers, q-tips, alcohol, elbow grease), re-grease with a good synthetic, return to operation.
Contacts - like an EM pinball machine, just worse.
Action: Buy flex files, clean all contacts under pressure.
Connections (Jones Plugs, Tube Sockets)
Action: De-Oxit - use liberally to remove tin corrosion. Pull / reseat a bunch of times. May need to clean with flex file or other abrasive, and then De-Oxit depending on what's wrong.
If you can fix arcade games, you can work juke boxes. People here can help you.