Forget the Atwood circuit board; replace it with a Dinosaur circuit board.
After 2 years of dealing with my intermittent furnace issue due to the circuit board getting wet (another Thor ingenious design - point the louvers into the furnace to funnel any rain into the electronics - mine gave out over thanksgiving. Bought the Dinosaur board and we're back in business.
Wire by wire replacement:
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1