I just installed the rev B board and harness and thought I'd report in. There were no instructions so I referred to this thread to ensure I was doing the harness correctly -- thanks for that.

My symptoms were that the NCs were erratic for a few games and then quit working. When installing the new board, I checked the fuses in the backbox and found one out and replaced it. I fired it up and all of the other AUX devices worked, but the NCs were still no worky.

A quick inspection turned up two fuses for the NCs way back on the bottom right underside of the playfield. They were *really* fried, all dark inside. Once I got them replaced, all was well.