Mlenow, this machine looks good. I'm no expert, but it's worth a test-play for sure. Here are three ideas I have for you to inspect further:
1. When you hit the prison doors, make sure the magnet holds the ball for a wee bit. If it doesn't, it's just a fuse to change out (F7) if memory serves, but that's the first tech issue I encountered when I bought mine in 2016;
2. Does the Well Walker register 'phantom' hits? If so, the switch underneath needs adjusting. Not a major issue, but something to know about, and might help you negotiate a hundred bucks off the sale price; and
3. You could also ensure the drop targets work and reset properly.
I hope this is somewhat helpful. Fun game. I'm in year five of owning it and have come nowhere close to Last Man Standing or Terminus. I make 'Horde' about once a year.
Cheers from Canada,
Winston.