Thank you all for all the response, I have not had a chance to look at the boards yet, or trace any wires, but just from a quick inspection I don't see anything on the wiring harness that looks out of place.
I'm getting my desoldering iron in today, so I actually have quite a bit of work to do on multiple boards, going to start on some Berzerk/Frenzy interconnect boards, they are simple and I have a slew of them, if I mess one up I won't be heart broken over it!
When the game starts it looks normal, I'm not sure what the test mode is suppose to do but I can't get anything to happen in test mode, none changes when I moved the joysticks or hit the buttons.