try running the light test via the front door red button, it will turn on/off all switched lights.
you could try reseating J3 on the lamp driver board, the lamp driver board may have 1 or more dry solder joins?
also likely the transistor Q51 on the lamp driver board that lights the spinner light is open preventing a path to ground?
regarding the continuous scoring, what score is being added? this will help narrow down what switch contacts are touching, also try the switch test via the red button on the front door, any closed switches will show in the credit/ball in play display window.