I'm hoping somebody can steer me in the right direction:

My Twilight Zone had acid damage a couple of years ago under the batteries. after cleaning the corrosion it all came good, but recently started to auto fire the balls at game start up (same as last time).

I found some new corrosion and cleaned it off, but made the mistake of removing the batteries with the power off, so when I turned it back on, it reverted to factory settings.

No problem, I reset the machine to free play, and it seemed to work fine, but volume too high, so I went back to adjustments, and the machine seems to have frozen up. Now it just says check fuses 114 and 115 on start up, and all buttons (enter, +, -, are inactive). I've powered down and remove the batteries, restarted - get the factory settings message, but then it goes back to "check fuses 114 and 115" and wont do anything else.

I'm hoping there is a simple solution to this. anybody have an idea?

Thanks for the advice, I found some more acid damage and fuse 114 was blown. I removed the Battery holder to clean it up properly and coated the board with PCB lacquer to prevent further corrosion. Machine is back to 100% now, but I've only changed to 5 ball, free play and volume level from the factory settings.

Does anybody recommend any other changes to factory settings?

Bad news for me. My original syptoms from 2 years ago have returned - "Clock is Broken" on startup, and machine can't find balls, causing it to empty the gumball machine and have too many balls in the outhole and continually try to push the extra ball to the ball release, but it just rolls back as this is already full. This was originally fixed by cleaning up the acid damage on the CPU board, but this method does not work now. I guess there is track damage under an IC or somewhere I can't see it.

Is there a reliable repairer I can send my board to for repair or exchange?

I purchased a Rottendog CPU board from AD amusements, plugged in and works 100%

Thanks everybody for your help and suggestions