Hello everyone,
I have exactly the same problem as the one on this thread :
https://pinside.com/pinball/forum/topic/please-help-stnng-gnd-short-row-1-is-stuck-closed-problems
However I can't find any blown fuses, I checked them all with a multimeter buzzer and they all show continuity. I put new batteries in as they were nearly flat but all that did was set the machines factory settings but it still pushed out 3 balls.
The problem arose yesterday when my young grandson (aged 9) ask to play it, as I bent down to switch it on underneath I didn't realise he was pressing the gun trigger repeatedly. it then pushed three balls out and showed the same error message as on the link above.
My backbox is different to the one on the link as it has ribbons everywhere