Okay I am going bonkers trying to figure this out, maybe I've over looked something, that is why I am asking in hopes someone can point me in the right direction.
Here is the issue, whenever the 3rd inline drop target drops, all other switches stop working in that row. So if you drop down the #2 target on the right side of the playfield the game doesn't recognize it was dropped, if you hit the spot drop target stand up target it will just try to drop #2 even though its already down. I have replaced the diodes for all switches in that row, I did find the 3rd inline target diode was indeed bad, shorted. Every capacitor under playfield has been removed out of circuit, I repinned connect J2 on MPU, Alltek MPU is in the game. I hit connector J4 with deoxit bc the column wire for the inline targets goes to that connector, just to see if I got a temporary fix. All other inline targets work fine and don't affect anything negatively once they drop. I've checked for shorts in each switch stacks themselves and came up empty. I checked to make sure each switch has the correct wires going to it and diode in correct direction, band away from the column wire color. That all seemed to check out. Pretty sure this game had a playfield swap as every wire and item on the underside is numbered, for what i'm guessing reassembly. Last two things I can think to try, swap out the alltek board with another, or repin all of connector J4, but with all other inlines working I'm not thinking repinning will fix it. What am I overlooking??