Quoted from TecumsehPlissken:Update: I put game in switch test to check something else and noticed that both of the yellow stand up targets give messages of ground short row when triggered in test. The top right side Yellow says ground short row 1 , white brown (wire) and the Yellow target lower on the playfield in center says ground short row 2 white red.
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Check for broken wires and shorts as stated by @pinballplusMN, then start working upstream to the boards, all the way back to the MPU and U20 chip.