Don't suppose that you tried any of the usual troubleshooting things like moving one end the ribbon cable feeding the bad board to a different board to find out if it is the controller or hash board? If the same channel stays bad - is controller or ribbon cable that's bad. If problem moves to the other channel board is shot.

Oh, and don't bother redacting worker names/addresses. That info is useless to hackers. Afraid someone is going to point their miners at it and throw more hash rate there for you?