My system 11 display was missing a segment, turns out it was a broken lead to the glass, pretty easy to spot when you look for it. Not really repairable, but you can unsolder and swap the entire glass which I did and it actually worked. A miracle given my soldering skills. I happened to have 2 displays, one with a bad glass and one with a bad board. Was able to make one good one out of the 2. Bought a Pinscore for the other game.

Mine was easy to find once I looked close enough. It will be near the affected segment.