We have a 2015 Lexor TS and the bath lights and the fan are on the same 10 amp circuit. Knowing Pleasure-Way it is probably the same with yours. Our fuse panel for this is in the forward cabinet, in the kitchen, passenger side. Yours might be in a different location. We both have the multiplex wiring so your fuse panel might be where ours is.
Check your owner's manual for the location, my manual has pictures and locations of the various fuses, circuit breakers. You can also call the factory if you need help, they are extremely helpful.
If it is the fuse, you should determine why it blew.
2015 Pleasure-Way Promaster Lexor TS