My slide is on the drivers side, the rail that holds the slide awning pulled away from the side of the rv allowing water to bypass the seals and run in on top of the slide when the slide was in. It then simply ran off the top of the slide and on to the floor. My second leak was running in the bottom of the slide rails and on to the floor with the slide in, like Joseph said, were the water is coming out isn't always where it's going in. They could not find the leak at the factory, It wasn't because they weren't trying. I took it back to my local small town dealer and he was determined to find it. At the top of the slide, on the corners, there are 2 caps about 5 or 6 inches square, mine were caulked around. Those caps do nothing except cover up a 45 degree seam so it looks nice. Water can get behind those caps, run into the 45 degree seam and run down behind the seal. The water then found a path on the rail attached to the side of the slide and ran into the rv. This was with the slide in. Caulking that 45 degree seem stopped the leak. I'm thinking they forgot to caulk mine but I'm not sure PC caulks that seem at all. Funny thing, mine didn't leak when it was new that I know of but it sure leaked shortly there after. If PC recommended not to order the slide to avoid leaks, they would lose 90 % of their customers.