Hello, I think I've troubleshot as much as I can without asking for some advice. I have a Jungle Lord with a Rottendog MPU. When I fire a ball, all of the switches on the #3 wht-ORN Row fire. I've replaced all the diodes on that row, but the problem persists. I have tested for short and can't find any. I am not sure where to look next. Any advice would be welcome!

I tested as you suggested and it is definitely a board problem. I guess I will try to get a replacement or maybe talk to the dude who made the board.

Just to close the thread, I called the company I bought the board from, K's Arcade, and spoke to a man there who indicated he had seen this problem before (I can not remember his name). He advised me to replace chip U17 on the board. The chip is a 74HCT9114N and they sold it on their website. I replaced the chip and it all works 100%, so thanks to the man at K's Arcade for helping me out.

Just as a side note, I can not for the life of me find the chip U17 on the MPU327 schematic, so there's a likelihood I would not have been able to diagnose this given an infinite amount of time.