After looking at a diagram of your interior, which is different from mine, I would say look in the panel to the rear of the shower, mine is under the shower stall.
Let us know where you find it.
2006 Flagstaff 831RLSS Travel Trailer
2007 Chevy 2500HD 'Classic' with the Duramax engine.
Converting a 1956 GMC PD4501 Scenicruiser, ex Greyhound into a motor home.