Mate, i feel ya pain.
I have a couple of "Well regarded pinball gentlemen"
visiting tomorrow, and of course my KISS which has been pretty much rock solid for years decides to throw a sound board wobbly at me.
Instead of playing "Shout it out loud" at the end. I'm getting a wacky Egyptian tune
So in trying to figure out if it's the board or connectors, i ended up creating displays that strobe, and a flaky ball return gate.
Fixed the above probs, but the sound is still rooted. Will have to convince the boys that it's "Custom" heh