My right slingshot was misfiring so I began to fiddle with the switch blade spacing. While doing that, the switch died completely -- along with the entire GRN-GRY column (lanes and slings). I yanked the diode out and tested it, and it was indeed bad, so I thought I'd found the issue. I reflowed the solder on the switch and added a new diode and ... no change. The column is still dead.
So: I have a few more wire continuity tests to do (game is on location and I'll be back this weekend) but I have a bad feeling this is a board issue. Could a bad diode or some other sort of under PF issue knock out a switch column?
And: I saw that upstream from the column connector are transistors (confused by that), is that likely the component that's bad? I do have a donor board I can mess with.
I did a bunch of searching and couldn't find any Stern switch matrix problems/solutions like this. Any advice on testing or potential board issues is welcome.