This customer called with a leaking roof. This was a low slope roof. With a low slope roof, the wind will lift shingles and drive rain water underneath them.
Upon inspection we found that the previous roof installer didn't install the roof properly and in fact the shingles were lifting.
Fortunately the home owner noticed it without to much interior damage.
We tore off old roof. Only needed to replace a section of the roof deck and properly installed the GAF Timberline HD roof system with two layers of underlayment.