Nothing to offer on a water entry point associated with the slide BUT....this sounds suspiciously like an issue I had with our 2010 39N. The rear of our coach is a full width closet / wardrobe but there is a water heater storage tank in the right side (passenger side) of that closet. I had one of those plastic fittings coming off of that tank crack and I discovered it because the carpet in the floor of the wardrobe was wet and the floor beside the bed was wet. That is right at the rear of our right side bedroom slide. Just sounds familiar....
2010 Winnebago Journey "Express"