Quoted from Dpg10:If i disconnect 1J18 from the MPU the game works and the slingshot does not energize.
This tells you that the switch is closed and there is no issue with the cpu board.
Quoted from Dpg10:Curious if the resistor or capacitor on this switch has failed.
Very possible that the cap has shorted out, this would make it seem like the switch is closed. Cut the cap off and retest.