I would do as recommended by hawkeye first.
Then, unless you can bring it to an rv repair facility, call your local dealer and see if there are any mobile Tech's in the area.
A thing to note is it's difficult to check if a board is good or not. There are testers that are quite expensive and they don't always tell the tail. I would have the heating element checked first to ensure there is continuity (no short), that's an easy test for a Tech to do with a good tester.
Good luck
... Eric