I know how to get the HWH system to auto-level. Park the coach, leave the key on, engine running, press the AIR button once, then a second time, then let the system do its thing. The manual says the yellow lights will go out when it's level, the red corner lights stay on until the key is turned off, and the AIR light stays on to indicate that the system is in sleep mode.
My problem is this. I'm pretty sure the AIR light is burnt out. I've never seen it come on, ever. When I follow the instructions, the auto-level process takes place, but the AIR light never comes on, and is not on afterwards while in sleep mode. This is making it difficult for me to diagnose other problems, like leak-downs during the night, because I can't tell whether the system is on or not, and should have been waking up to auto level every 30 minutes.
I know I want to replace the Lexan cover plate, because it's got multiple holes in it, and I've read posts about how to do that. But should I replace the entire circuit board at the same time, or is maybe that one red light serviceable/replaceable. All the others come on as they're supposed to.