I got the replacement board from Thor. When I removed the original board I did find that there was water under the board and several solder connections showed some corrosion. I'm not sure where the water came from. The cover plate on my ACE is solid (no louvers) and only has a hole for the burner exhaust. Something I will have to keep an eye on.
I suspect that the original board is functional, but I changed the boards out away and the heater appears to work now.Tough to check when its already 78 inside the coach, but the blower runs and heater lights as you'd expect it to.
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