I've been repairing games for a decade now and had hands on in the 1000s, and I'm pretty well frustrated with whatever is causing this issue.
This is a Fireball 2 machine. I *think* it is a switch matrix issue. However, all switches work well from 40 down to 1 in the switch matrix test. I can't find any missing or jammed switch diodes.
But, the error happens with the post kicker button. It'll work 100% fine, even when the drop targets on the right side are engaged when there is no ball in the outhole. However, IF there is a ball in the outhole (which obviously there is for most of the gameplay in regular play), when the second from top drop target on the right bank is down and the post kicker button is pressed, the game will tilt. When the bottom drop target is engaged, and the post kicker button is pressed, the game will fire the Odin saucer.
I've shotgun replaced diodes on all the offending switches, read about every diode in the game as good, tried two MPUs, two solenoid drivers, the connectors have all been repinned. It still does it with the sound board isolated out.
The interesting thing is the outhole is 01 switch. When it is not pressed, everything works fine. When it is and those two drop targets are down and the post kicker button is pressed, the switches that engage (tilt and odin saucer) are two over on the exact same row.
Maybe I've just looked at it too damn long, but any help with a fresh set of eyes or brain would be appreciated.