Crack on the top?

Hello all, it's been a long time... Just wanted to share a problem I had, as a heads up to others. A couple of weeks back I noticed water on the head rest of the driver side back seat. I checked it after every time it rained and every time there was water there. Driving home in the rain Thursday, I saw water actually dripping from the plastic trim over the rear window. Friday, I took off the brake light and saw no signs of water intrusion so I decided to look around the roof racks. Well... there is a long crack in the channel that is immediately next to the driver side roof rack. About 8 inches long and close to 1/8" in some spots. I used some RTV to seal it and checked the interior for water this morning (after a stormy night) and it was completely dry (just wanted to confirm). I have never used the roof rack so I don't know what can cause such damage. The RTV is a temporary repair until I figure out how I want to fix it...:cry:

That is unusual for the sheet metal to crack. Unless it it a seam where the roof panel is more than one piece. When I eliminated my roof rails. I noticed a soft painted spot, at the rear. I suspected that the roof is not one peice.

GL.......

I saw the soft spots. I don't know if they are multiple pieces but that makes sense...