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Using alligator clips, put one end on ground, and tap the metal tab on Q40 on the LDB - that should light up the Playfield Shoot Again lamp. This will verify your circuitry to the playfield. For the backbox, same thing, but Q3.
Not sure what to tell you about the game code not working. All I can suggest is to manually make the A & B lanes to light the extra ball to verify whether its working.
Paul -
I suspect the connectors on the cable harness are causing issues. IF stuff starts happening again, look at the pins on the cable harness - if they are corroded, they should be replaced. I don't know your location or level of expertise, but replacing the pins can be tedious, so there may be someone in your area who has the experience/tools and could help you walk through it. Congrats on getting it going! Repairs are half the fun.
Bill C
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Pleasant Plains, IL