Did the Pioneer sell and if so how much?
I have one in the back of the garage that is packed up as I don't have room to set it up (Mrs Bossninja wont let me move into her side of the garage).
The backglass on mine has suffered from sun fading of the red colouring. Playfield is generally OK but worn just above the flipper area. This was one of the first machines that I was able to fix - the bonuses wouldn't count correctly. Pulled the stepper apart, followed Shaggy's guide, and presto!
When I bought mine, it had the schematics still inside. If anyone has a Pioneer and needs the schematics, let me know.