Some strange things going on with a Bally Paragon I'm working on. Bottom Pop bumper wasn't working so I figured its either a switch issue or transistor on the board. Pop bumper switch seems fine, it scores but doesn't pop. Grounded the Transistor on the board and it works. Figured it was a whacky transistor so I replaced it with a new TIP102. put everything back together still doesn't work. HERE IS WHERE THINGS GET WEIRD... Once I ground the transistor out on the board, the pop bumper starts working for a while on its own, almost like it got jump started??? It stops working after a few games and goes back to just scoring.
Any suggestions or theories on this little odd behavior?