This seems to have resolved itself without me doing anything; after putting the playfield back down after adjusting the flippers, the game wouldn’t add any credits even though the start button switch contacts seemed fine / led flashing away- all diagnostics for switch’s and DIPs showed the game was okay. Can anyone familiar speculate what the issue might’ve been? The game has had a few hacks around the coin door loom- not sure if this is had anything to do with it the start button not registering