So I'm continuing to dig this one out, but here is the story.

I picked up a granny and the gators, and it's locked on the big coil at power on for the reset drop targets, which is transistor q36, pin 4 on the connector for the driver board.
The transistor tested fine, but I replaced it with a tip 102 anyways. Still locked on. I took my good baby pacman board out and put it in granny, and all is well.

When I put the ''bad'' granny board in baby pac, same thing, locked on coil in the baby pac instead. That area around q36 tests fine and nothing seems out of the ordinary.

A little back story, the connector that powers that specific coil was out of the connector at pin 4. Either because it fell out, got pulled out, locked on, or whatever, but I can also assume that it's possible someone plugged it in the wrong spot as well. Again, granny works fine with the baby pacs board, so it is something on that granny driver. I've tested around the board, I don't see any shorts.

What could be causing the lock up? I'm wondering if it's a switch issue, as when I picked it up, the switches were making contact even when the drops were UP, on Granny...though i'm skeptical that would actually cause short to the chips?

Thanks in advance

Any idea which chip drives it? I’ve replaced u3, u4, and u5 , trying to dig through the manual to find it

It was the U4 chip - solved