I suddenly have a whole row and a whole column out (lamps don't work) in the lamp matrix of my WH2O. Worked fine for years. Before I dig into it, I was wondering if somebody recognizes this problem (and what the culprit normally is). I don't see any obvious open or shorted wiring under the playfield. Reseating J137 and J133 on the Power Driver board doesn't help. I'll probably swap out the Power Driver board next to see if that's where the problem is.