Thought I would share what I discovered when looking for my water leak. I have had the truck fot 3 months and known about the water leak into the passenger floorboard for about 2 months now. I replaced my 3rd brake light gasket and still had the leak. Removed the Rt. front kickpanel and used the water hose to try to find the leak. It turns out that water was dripping in through the upper door hinge. Just aft of the door hinge, there was a tiny 1/32 in hole in the A-pillar where the door hinge is mounted. I was able to blow compressed air through the hole. The drivers side was sealed, but not the passenger side. Sealed it up with butyl rubber sealant and no more leaks. Hope this helps some other members to find their leaks. 
