So I picked up the 835

If they are little tan 3/8's" plastic hoses they are for draining the hot water tank. They each have their own valve and one may be breather. When I evacuate the camper fresh water systems I usually keep all those valves (and the main water drain valve at the pass side rear open (at least on my '98 Lance).
A couple times I failed to close the valves and could not figure out why the main fresh tank would not fill.....until I went around back and saw the water just flowing out onto the ground. In one end and out the other.
jefe