I've had this board out and looked at it closely when replacing the resisters. No lifted or otherwise compromised traces.
The problem is on the display controller board, not on the individual glasses. I swapped the displays and Displays 3 & 4 work fine when they're plugged into Players 1 & 2 - conversely, display 1 & 2 have the problem when they're plugged into players 3 & 4.
I have an idea it's the next chip up the line - the 7180 high voltage controller. Earlier I mis-read the schematics and thought it was the next chip down the line, the 4543 "BCD to 7-Seg converter" but after re-examining the schematic, it looks like maybe it's the 7180. I hate to just keep "shotgunning" these chips so- maybe someone has some experience with this board?
I have a firepower that has two missing displays at 3 & 4, I suppose I could just swap the boards from the two and then you wouldn't see the problem on 3 & 4, but to me that's akin to Cutting out the Replay knocker on an EM game when it sticks on. Ignoring, and cutting out a problem coil/display/toy etc, is not the way I like to fix things. I get really pissed when I see other "technicians" have "fixed" games in this manner. Besides, I get such a rush when I fix one of these things - the harder it is to find the better I feel when it's fixed.
-Brian