Hi Ken & Joyce,
If your coach is a 2003 Adventurer G35U then the sofa gets its power from a 25 Amp. breaker located in the 12 Volt breaker panel just beside the entry door (no fuse). It should be the only 25 Amp. breaker in the panel, bottom row, second from the right as you look at the panel. If your coach is a different model, let me know and I'll look it up for you.