I just bought a Road Show. It's in great condition overall, but has an issue with the bulldozer arm.
Initially, it was not sensing any hits on the arm. I adjusted the potentiometer on the Eddy board so that the LED just barely went out. The sensing issue was also happening on Red. I adjusted this one, too. Both areas sensing normally now (I think).
Now, the bulldozer arm seems to be behaving oddly. It works well during the Dozer test. The switch test indicates that both the up and down are "closed" when the optos are open. When obstructed, the switches appear "open" on the switch test. I suspect this is normal behavior.
During the game, the Dozer arm seems to sometimes stick between up and down position. It will sometimes raise or lower very slowly and haltingly. Sometimes, during MB, the arm will be down when it's time for a Ted JP, and his mouth is open. Sometimes, balls will get stuck on the arm because it is at just the wrong height. I'm just not sure what's going on. I put a little lubricant on the pivot points of the arm, but it really seems like a board problem rather than a mechanical one. (Otherwise, the test wouldn't work..?). Any ideas? I will link to some videos.