Quoted from TZ:
However when I do this with the game on, and in the attract mode, I get the same thing for the left side, but I get a closed circuit on the right side (without closing the switch). I would expect both side to behave the same, but I'm not sure which side is normal and which side is acting up.
You cannot use a DMM to check continuity when the power is on as any voltage on the circuit will affect your readings. What happens in test functions?