I live in an intruder built on a Workhorse Chassis.
The slide out will have fuses, not breakers far as I know
On my rig there are 4 fuse panels
The main house panel you likely know where it is and it's likely different location than mine, likely does NOT have the fuse for the slide outs. But do not rule this one out.
The main chassis panel is front and center,, You open the hood, stand directly in front and there is a big black box, no label, that's it. Also likely does not contain fuses you are looking for. This is a 100% chassis box.
The Aux Chassis panel.. On my "W" series it's near the parking brake, likewise, nothing to do with the slides.
Back outside, under the hood, over on the driver's side is another black box,, This one says "Intelletec Battery Control Center"
That's #1 on my suspect list as to where you may find the fuse.
Most of the slide outs that Damon used use a current lmiting controller,, Here is how it works.
Rather than switches (limit switches) that sense when the slide is in or out it measures motor current, and if it spikes too high, (Indicating the motor is stalled) it assumes "Limit of travel" and shuts down.
OF course lack of lubrication and other issues can stall the motor.
Home is where I park it!