Answer varies w/ floor plan, but suspect you may need to FIND or cut access Panel in adjacent wall paneling. Sometimes, it is there, hard to see, small brass screws to remove panel. If not, option is to gently cut one w/ Oscillating tool, or remove entire panel? I found mine behind shower,= beside bed, (a tight spot for a old, fat man, not so much for a young grandchild, LOL); believe I maybe did remove and look a few years back.
2000 Conquest LE 6266, Class-C on 99-E450SD, 6.8, 2v, V-10