Quoted from SantaEatsCheese:Sure enough my D8 is dead on the display board and is likely my problem. One is coming in the kit I ordered so hopefully it will be back up soon.
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Gotlieb used individual diodes instead of a bridge rectifier on these boards and yours is blown. Fingers crossed that replacing it resolves the issue. If you replace it and it blows again, then you have a problem with your transformer panel in the bottom of the cabinet. The display is fed directly from the transformer to the rectifier and and is an isolated circuit. I don't know of a way to repair the transformer and a replacement might be hard to find.