SoundGuy wrote:
That thin paneling on which the television wall plate is mounted is secured in place with just a few small staples so with a little care you should be able to remove it without much difficulty. That in turn would allow ready access for fishing wires up into the ceiling and over to the vent area.

Last night I took some time to examine how that panel is secured, and yes, I can confirm that small staples hold it in place. That's encouraging. I will still communicate with our dealer's tech to confirm I am on the correct path.
You may have seen part of the rig's wiring harness that runs vertically in a bundle behind that panel when you installed your accessories. Hopefully that's an indication that there is a sufficient opening in the ceiling above that hollow area to fish the power I need.
There is another 192RBS owner over on the Coachmen Forest River Forum who has a similar interest as mine and has faced the same challenge. Hopefully resolving this will help him as well as other owners. Have you considered opening up your roof for a ceiling vent on your 2014 model? At a minimum, the static ventilation for our unit has been a good thing. But penetrating your roof takes the project to a bit more challenging level. Certainly doable, though.