I read someone had a problem with a burned out resister R-15 on their display board and was asking if anyone knew the resister value. My heater showed the CE code and when I removed the board, I can see that R-15 is burned out. Although others say the board can't be fixed, it looks like a relatively easy task to change this resister if I knew the value. Seems worth a try before replacing the entire board. Anyone know this value?