I'm running the stock RC3 firmware for BB-Dual. Fan0 on Rumba board goes to left hot-end fan and left snail-cooling fan. These work properly when the hot end is above 40c. Fan 1 on Rumba goes to right hot-end fan and right side snail-cooling fan. Does NOT come on at all when hot end is higher than 40c. If I swap the fan plugs (with Fan0) then the issue follows. It seems the Fan1 plug does NOT get turned on at all. How do I fix?