Quoted from jgadzia:all the switches are working. i tried firing a ball up through and all the switch test check out appropriately. Bad ROM or CPU board?
It seems weird for a ROM or CPU to go bad in a way that affects a single game rule.
What KJL is saying is that all the switches may be working, but if not activated in the correct order during the ball launch, this may be your issue. Say for example there are two different switches triggered by the ball entering. Or maybe due to a short, or a misplaced wire travelling through a switch, a different switch also gets activated. If the wrong one is registering first, it fails your skill shot. Just one possibility.