If the board is not a potted board you can remove it and look at the reverse side for and burnt or discolored solder tracks. While it is out you can try cleaning the contacts also. If it is a potted board it can be checked with a multi meter. Attwood has a guide on their web site, Suburban should also. If problem is intermittent check the ground that Bud mentioned this fixed my issue before. I had this intermittent issue similar to yours where it worked sometimes and not others. Sometimes I would get 12v to the board and sometimes nothing. It drove me crazy for a long time. Every time I would check the brown 12v wire it would read 12v, then when I checked it at the board sometimes it was fine other times it was bad. What it turned out to be was a loose crimp. When I closed the door, the door hit the brown wire sometimes loosing the 12v supply. Re crimped a new terminal and all was good again.
