So, I've had this NGG for over a year now, unable to solve this issue. I've had a tech work on it, and replaced various parts.
The issue is that the "Upper Right Eject" will fire randomly while playing the game. It never does this in the test menus, nor before I bought it and when my tech friend took it home, it never happened there.
I've replaced the following parts with no success: Opto's, Opto Board, and MPU Board. I have a NBA FB that I borrowed the Power Driver board, and had an assortment of new issues happen when I tested this, where it would constantly eject balls, and I couldn't start a game. I quadruple checked all the connectors and they were correct. Swapped everything back and my NBA was behaving as normal, and the NGG was back to behaving fine except for the right eject.
Any ideas? Maybe something stupid that we overlooked?