Junk Yard pinball repair

I’ve been fixing up my old Junk Yard machine, and I’m having an issue with the dog play mode. The scoop works, and when I complete three scoop shots, DOG is lit, the scoop drops, and I can shoot down the alley to the doghouse. I confirmed the Dog Entry switch is good, but when I shoot during a game, the game treats a ball dropping in front of the dog as if it was a sewer shot, awarding me toast and shooting the ball right away. The Run From Spike and Shoot The Dog modes do not start. I think there must be a switch or sensor that isn’t firing, but I can’t tell which it is. Does anyone have any ideas? Thanks in advance!