[Chester Stone]

David, since you have two a/c systems, I suggest you go ahead and install the relays on the unit that is operating. Doing so will give you insight as to how the board is wired to the relays and may give you an idea whether on not he faulty one can be bypassed. Also to the extent that resistors and other components need to be replaced, the operating board should show part numbers. Another thought is to take both boards to someone who is talented working with similar electronics to see if he can repair the burnt one by referencing the good one. Just trying to solve a very difficult problem.