The original everything worked before moving to the new house (which is when the sound board fried and it kept tripping my breaker). After that, D19 stayed lit, D20 off, D21 lit no matter which board I had them in. One time when I removed the data cables it looked like D20 was flickering randomly, but I believe that was before we fixed the low voltage jumpers at the regulator. It's never flickered since.