I've had this problem on my last two campers. The previous one being a Coachmen. After working with the service manager, Tech, and my own intuitiveness, we realized several issues. First, most of the factory installed cables are not lubricated. It helped when we pulled the wire out of the cable housing and squirted Lithium grease through the housing.
The cables do not like sharp bends, especially at the point where the wire enters the valve head. In the case of the Coachmen, the valve heads were pointing straight up toward the floor of the camper, requiring the cable to make a 1" radius, 90 degree bend. The correction was to reposition the valves such that the wire entered almost straight!
The last, The cables are not fastened in place and after pulling the handles repeatedly the cable and housing will reposition themselves most of the time creating sharper bends. Once you straighten out the routing of the cables, they need to be secured with simple clamps and a screw.
My present trailer is also an Open Range. Both of my valves, having been serviced once by the dealer, once again need work. First job will be to cut access doors through the full length belly skin. Next will be to replace the seals which have apparently come out of their pockets, as the valves don't close! Next will be to see about repositioning the valves to accomplish a smoother routing of the cables.
Bandaid
