LG DLE 7177RM - intermittent no heat. When tested on run with no drum and motor pulley up there's power at each of the legs on the heater. The heater coils were tested for continuity - all good. Installed new board - heater worked for 4 cycles. Then stopped working. Tried again, no. Tried again a few hours later - worked. Tried again 12 hours later -no heat. All of the thermostats have continuity, there's power on each of the 120v legs at the heater. Continuity between motor and thermostat. And again - new board.

I'm totally stumped.