Can you post a picture? Was this a new or new to you camper? There is a skirting of material to fill the gap from the ceiling to the folding door/wall section.
What year is your 3023? For a short time, TM installed a toilet vent hose that went through the bathroom wall, above the sink, and exited through the roof of the kitchen. I think that is no longer done.
I think they are talking about the built-in TV monitor on the bathroom wall facing the kitchen area. They were only featured a few years and it’s pretty rare to come across one that still works.