Hi Tim, I don't know which version water heater you have, but mine is in a 2016 Ul31 Precept. My heater version is "-1M". I changed out the gas control module. it was fairly easy. Be sure to turn off all power and disconnect the coach battery(ground). It is located behind control housing panel that has the red light and on/off switch. In the attached photo I highlighted the 3 screws to remove. Carefully move the wires out of the way and take a picture of the wire connections & Gas controller. Also take pictures on the right side panel with the model and serial numbers. that might help as well.
Good luck.