I have a Rescue 911 that everything works, except for two optos. The shooter lane Opto and the lower Heli drop Opto. Both are locked on. They are locked on, even when the optos are not physically plugged in. So long as their Opto control board in plugged in, they show as locked on. I even switch control boards with a known working one. Still locked on. I am fairly new to System 3 games and can't seem to figure out what is crossed up here.
Any thoughts?
Thanks,
Randy