Do you have any battery damage?

Check that adjustment A2.12 "Photo shoot" is set to OFF.

Reseat the short/wide ribbon cable on both ends at the MPU and driver board.

Get some deoxit with a needle end applicator. Put a drop in every hole of both sides of the ribbon cable and every male pin on both boards that the ribbon plugged into.

That'll help guarantee this does not come back.

Yes, it is expensive. I have had thr same container since 2016, so $5 a year so far, and I still have more than half left. It is worth it.

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I never had a need for that in 14 years of working on games

And no one needs a pinball machine but here we are...!

Zero need. If any rare occasion need to clean any header pins, alcohol and toothbrush. (Non-battery type corrosion). And it is rare I need to do that.

I have bent some header pins before unplugging ribbon cables. So make sure header pins are always straight because bent pins will make a bad connection in the ribbon cable.

I should has mentioned this in my first post.

A full set of new IDC cables is about $20 - after 30 years I would think that's a pretty good deal.

Adding chemicals to solve a mechanical problem just isn't the correct fix.

I would like to love DeoxIT.

It sounds like a great idea.

I'm certain that in new production, particularly with gold connectors, it adds a modest amount of reliability.

However, in my experience, any connector I'm suspicious of is twenty, thirty, forty years old, made of tin, with a specified 'after thirty insertion removal cycles replace me' life cycle...

Thirty insertion removal cycles? One afternoon of pull your hair out troubleshooting and I've exceeded that! Hehe.

I used DeoxIT on a bunch of things fifteen or twenty years ago, and there was no indication whatsoever that in a pinball environment, working with already compromised connectors, it showed ANY improvement in reliability of a repair.

It's just not a good pinball product, in my experience.

Particularly on your machines connectors, which are now thirty years old. (Getaway was released in 1992!)

The answer? Replace the ribbon cables. If that doesn't work, post here and we'll help you go further.