The circuit breaker will be the small ones located near the batteries. These are the little red boot covered breakers. Some are auto reset, and others are manual reset. To check these, you will need to feel each one for the reset button. If one of these are bad, you can get these at an auto parts store, NAPA, AutoZone, etc....
Our bedroom slide started having issues going in/out, and it turned out to be the gearbox. The gearbox is on top of our slide behind the molding trim.