This must be "RottenDog" failure day. My Bally Xenon lost her RD power supply yesterday. Think it is a bridge rectifier but still troubleshooting.
Regarding your Firepower.....
Your connectors on the board are at least up to date. Someone has already re-pinned those at some point. They may still be your issue, because certainly they are NOT brand new.
Something else to consider. All of the wire bundles going to the boards have intermediate connectors so you can take the head off. Whatta ya wanna bet those have never been re-pinned? Real pain because you have to do both sides, male and female. Start with the one that takes the switch signal back to the board...... If that works, great, but remember to go back and do them all.
If you need help with getting the right tools for doing the re-pinning let me know. I recently did both of my games and can get you into the right tools. Yeah, some of them are kind of expensive. It is however best that you have them. Re-pinning is part of owning cool vintage pinball machines....