Suburban 6 gallon water heater issue

Ok. Using the information above from Old biscuit, I tested voltage all through the system. Good twelve volts at thermostats, then on the red wire at the board, but only .5 volts on the brown wire at the board. There in lies the problem. Solenoids are not operating properly to open gas without the proper voltage from the hoard. Thank you Old biscuit for walking me through this.

I don't know how but perhaps the fire burned the solenoids and then sent some kind of surge to the board frying it. Who knows.
Now I know which part to get to fix the problem.
Is there a preferred board to get for the Suburban 6 gallon water heater?