There should be two valves in the front compartment near the hydraulic pump. One for each of those main slides. If you're lucky the one on the outside (street side) should be for the street side slide and the inboard valve for the curb side slide.
You may have to just bump the slide switch to take some of the pressure off the valve to make it easier to turn.
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Michelle & Ann
2018 Chevy 3500HD Crew Cab High Country DRW, D/A, 2016 RW39MB, Dual ACs, Auto Level, Auto Sat Dish, Stack W/D, King Sleep #, 17.5" Sailuns w/Disc, MORryde IS & Pin, Comfort Ride Hitch, 5.5 Onan, Res Fridge & Induction Cook Top
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