I'm posting this to help the next guy who has this problem. I lost 110V power at the following outlets:
- Behind bedroom TV
- Right corner of bedroom
- Above sink
- Above dinette
- Hallway
I got really lucky and found out that the problem was a small button on the aft side of the inverter in the bay to the left of the doorway. The inverter is below the sink, but you have to access it via the outside bay. This small button is really hard to notice. I could have gone years without finding it. I found it by accident. Had I not found it, I'd probably have spent a fortune having someone debug this for me.
If I were smart, I could have figured this out from looking at the wiring diagram found at
https://www.winnebagoind.com/diagram..._524g_wire.htm, but I'm not that smart.