Yes, check fuses, some under pf, some are in the cab by the front. Also there are under pf transistors that drive pops etc, and pop bumper boards. There were a handful of tech bulletins for the sys80 games, maybe those weren’t done?

I wonder if you are having coils or other things staying locked on.

With those old games, it isn't a bad idea to just shot gun all the under pf transistors, rebuild or replace pop bumper boards, verify the ground mod(s) and check the edge connectors/replace.

You'll have to see what those fuses are for, and start tracing the wiring to see if there is a visual issue on that line or troubleshoot a logic issue.

Not the perfect advice but my BH did random crap when I got it. I ended up buying the pascal all in one board, and the game worked except some coils which I replaced the under pf transistors and rebuilt all pop bumper boards. Then I shipped all original boards out to Clive at the coin op cauldron to refurbish. Those components are super old so any component that’s out of spec could make some funny stuff happen. Maybe it’s worth having all the boards looked at? You also may want to consider repinning all or most of the connectors as another safe thing to do.

awesome news! Yeah, this is exactly how I learned as well. It is SUPER daunting at first, but have a manual and a forum post and you'll find help