I have a roof which refuses to stop leaking. We had it completely redone (removed asphalt shingles, replaced rotted or bad boards, and re-shingled) about 5 years ago. All of the problems went away except one spot which continues to leak.

The roofer has been out a few times and chaulked/sealed around the chimmney, and other spots, but it refues to stop leaking.

I don't have a steep roof, and the spot that leaks, when you look at it from outside of the house, has a slight dip to it. So, my guess is that water is traveling back up the shingles and coming in due to the dip in the roof. Does that make sense?

Also, what is the solution to fixing this dip, if that is the problem? Can the roof beams be pushed up and resupported so the dip disappears? Or is there a better recommendation? I look to the pro's to help me out here. Thanks.