Playfield has been somewhere damp, then? That would also explain the rust on the assemblies and why there aren’t many original boards…white mold / powdery mildew
Also posted in Technical Help for wider visibility.
Our Fish Tales is occasionally launching two balls instead of one. It also, sometimes, auto-launches a ball immediately after drain (and the game carries on as though the drain didn’t happen). When it auto-launches after a drain, the colour LCD shows the score in dual-colours - as though the colours are setup for different text than what is showing (if that makes any sense).
Any ideas?