Steve, his passenger side bedroom slide is hydraulic. Only the one with the bed should be electric.
It could be a bad wire connection at the solenoid, since the pump runs indicating the wall switch and pump motor wiring is OK. Following at the end of this is a copy of my post on the topic last fall, which may help with sorting out solenoids.
Most likely the solenoids involved are the second set of opposed ones working from the pump motor out. If you don't have hydraulic jacks, then like me you probably only have 6 (3 sets) of solenoids on your manifold, and the set in question should be the middle one.
Make certain the coach is blocked properly before crawling under there so it can't come down on you unexpectedly. Now admittedly I've never actually tried this myself, but its a technique my GM service rep brother-in-law taught me for internal engine diagnoses, and could conceivably be useful here: try having someone hit the switches while your ear is to the handle end of a large screwdriver pressed alternatively to each solenoid. You may (or may not) be able to discern which isn't opening when it's asked to; you'll have to be able to communicate with one another - I'd use walkie-talkies if you have them. You could always first try simply wiggling the wires to see if they're loose or get a response at the helper's position.
If the solenoids seem to both respond for that slide, then I'd suspect a faulty ram behind the slideout, or something jamming either the scissors or the slide box itself. A jam I'd suspect would make the pump squeal though, which you'd have noticed already.
I'm confused by your statement that the slide is apparently now inboard, but the scissors are "extended" - to me they would be retracted in that position. Regardless, the first easy check is to make sure nothing has fallen behind and is blocking the slide from going out.
It's also possible given that particular slide is furthest from the pump, that you have low fluid or a leak along that hose route. The bolt/cap for the tank is forwardmost atop it, so you can check the fluid level, which may not be easy given its accessibility limitations.
-Joel
Posted last October:
"Here's the way I think things are arranged for those of us with several slideouts, as partially plagiarized from another resource:
The slides are numbered one, two, three, four in a counter-clockwise direction starting with the one behind the driver. So if you had 4 slides hydraulically operated then the streetside frontmost is #1 and the front one on the curbside is #4.
The hydraulic solenoid valves are numbered similarly starting with the set closest to the pump and moving outward. So the set closest to the pump would be for slide #1 and the set furthest away is for slide #4.
The wrinkle for us with 4 slides is that slide #2, usually the bed, is electric and that implies slide #3, curbside bedroom scissors-type, would be run by the second solenoid set. Set 3 would then be for the curbside front slide. I think solenoid #4 is for hydraulic jacks if you have them."
