2012 Ram 2500 Water leak

I noticed a significant water leak in the area of the C pillar, passenger side of my 2012 Ram 2500. I made the video to give any other Ram owners with a similar issue an idea of what it takes to drop the headliner and chase down leaks.
This vehicle has the extended, lifetime MOPAR warranty, but the dealership was quick to point out leaks aren't covered. The dealership has a 3rd party "water Dr" who chases leaks. I just decided to go it alone and hence this video.
I realize some of the headliner staining could be from the sunroof being accidentally left open when the rain came. The waterfall and subsequent ponding in the under rear seat storage was definitely NOT from the sunroof. All of the sunroof drains were clear and routed properly out of the truck.