Just a question to anyone who may be able to help, there is an issue I can't work out at the moment. It's some kind of malfunction/glitch with the CPU that affects the digital scoring function, i.e. every time I get a bonus after losing a ball, or when scoring a jackpot during gameplay it is something crazy like 999 999 920 989 (or similar), so its impossible to know what true score I'm getting. Its been doing this since I bought it a few weeks ago. This glitch even effects the service menu function as when I try to choose the various functions it malfunctions (regardless of whether or not I use the flipper buttons/start button or the actual buttons inside the coin box). I did manage to eventually do a Factory Reset and Audits reset etc but it didn't help. The numbers of most of the settings come up as 999 999 989 (or similar).
I was hoping (to the point of praying) that by replacing the Game ROM A3.O3 and Display ROM0 A3.00 that this would fix it, but to my dismay it didn't make any difference.
The original battery area looks clean and it had previously been relocated to a better position and I have changed to new batteries. The CPU boards look like they are in quite good condition.
I am really hoping that someone can help me sort out this problem as its really disheartening.