My Data East Star Trek is having an issue where pressing a switch on a particular column will activate all the switches on the row associated with that switch. Any ideas? For example, pressing the left flipper button will cause the game to slam tilt. Pressing the shooter lane switch will cycle all the switches in that row on the switch test.

This whole thing started in the middle of a shop out. I've looked for any switches crossing over or grounding out but haven't seen any. I have very little board repair experience. Hopefully that's not it.

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