Cabin lights and water pump won't come on
This is a 2022 Unity RL. I am helping my in-laws de-winterize it, and found the coach lights, overhead fans, and the water pump would not turn on. Other components such as the slide out stairs and the Firefly touch screen for controlling the coach would turn on no problem. I then tried connecting to external power as well as running the generator. With both, I was able to power on the TVs, DVD player, etc. but the same 3 items (coach lights, overhead fans, and water pump) would not power up, so power in general is working ok, but there is something specific to these items whether on battery power or on shore/generator.
This RV has the Freedom XC Pro Inverter, and in troubleshooting, I found something that is probably related. While on battery power, when I power on the inverter using the button on the front, it will power on for about 8-10 seconds, and the power off. When it powers off, I can hear an audible click coming from my right when facing it (near the shower), so it sounds like a breaker is tripping or similar, but the breaker box is in the opposite direction, and when I check, I haven't found any tripped breakers. When the RV is connected to shore power or on the generator, then the Inverter powers up and works/displays as expected.
My father-in-law had some electrical issue in the past (hard to tell if it was the same thing), but he called the place he bought it from and they had him go through the steps he refers to as the "G-12 problem". He described this to me as taking off a panel in the bathroom that is inset in the shelf on the right as you walk in, and there are a number of plugs. There is a specific one that you need to unplug and leave disconnected for 15 min. I assume this is hard resetting the inverter based on other posts I read. I also read that sometimes it takes several hours for this process to take, so I left it disconnected last night (12 hours), and tried again this morning, and no dice.
Has anyone come across this, and if so, any suggestions?