I had one of my discharge handles come off of the rear of my 35QSIK while out on a trip. If your underbelly is constructed like the Sabre's you should be able to remove 2-3 screws off the side where the underbelly material attaches to the frame and then be able to take a flashlight and shine into the underbelly compartment. When you see the dump valve with the missing handle, it'll have a stud sticking out. Mine was long enough that I was able to get my hand in there and pull it manually, it slides very easily. The whole job took about 10 minutes and I left those screws out until I had a replacement handle. Hope this helps!
2013 GMC Denali-HD, 4X4,Diesel, Allison, Crew Cab, Dually, Demco 21K Dual Pivot 5th Wheel Hitch
2013 Sabre- 35QSIK-6 Platinum Edition, Fireplace,Wood floor, Central Vac, 13K secondary AC, Washer/Dryer Combo unit, 4 point auto-leveling, Trail-Air Suspension, Trail-Air 18K Air Ride-King Pin Box .