This is what a Jayco service representative stated...
..."You will know that the drain cups are working properly because there will be no water building up inside of the unit. Its not a super complex concept or system that go behind the drain cups."...
Problem is, if you do see water in the coach the damage has been done. I am always very vigilant about water issues. I did not notice anything unusual until I spotted floor discoloration behind the driver's seat, and when I felt the floor it was soft.
Brought the GreyHawk to the dealer and after a technician assessment I was told the bad news. Go to this You Tube video link
... for the Schwintek Slide-Out installation ... Educate yourself and visit Schwintek and down load the maintenance manuals. Jayco states in the owners manual that the Schwintek system requires little maintenance; Jayco does not provide any information. Schwintech requires a special CRC teflon-base lubrication teflon for the track, shaft collars, and gibs.
Also, better check the fiberglass cap roof seem where it interfaces with the main fiberglass roof. If you have full body paint, Jayco paints over that area on top of the Dicor lap sealant. Although Dicor states it can be painted over, the paint can lift if the Dicor is not cured or not thoroughly cleaned with alcohol. Go to this You Tube link ...
... and see how the paint blistered up on my rig then water entered the coach.
No help from Jayco at all ... their mantra is its a maintenance problem that the owner is responsible for.