If you have a decent dealership near you take the board and see if they will do a bench test for you.
But the down side of this is if they have a board in stock, you may feel obligated to purchase, especially if wife is with you. (😬)
I took the bad board to the dealership that sold us our rig, they benched tested it and it was bad. So I bought a new board. The good part is I called Atwood and they said the board was under 2 years old, so it was covered by warranty, but had to be tested by a certified tech.
The dealership called and said it was bad, so when the dealer received the new replacement board, they refunded us our $200 for the board I purchased from them.
But try Dinosaurs Boards, do you have a return policy with the sender?