I hate to be the bearer of even worst news, but I believe that the leakage problem has a lot to do with the many like me that had to put plates in for the rollers. Slide-out plates have been covered by several threads.
The Wardrobe slide sets on rollers. The bottom of my slide where the most forward roller is, had become very spongy and the fabric tore because the weight of the slide forced it downward and to rub on the cabin. FR used plywood down there that delaminates and it most likely is interior plywood. This is even a greater problem on Bunk House models, because the slide is longer and heavier.
Sorry for the news, but it is a design and water problem