One thing to keep in mind is that where it is dripping through the ceiling isn't necessarily where the leak is. It might be leaking three feet away, running across the roof support, then dripping down there. Or perhaps your sheet rock is sloped and that's the low spot. You have to address the whole roof in order to fix this.
But most likely the leak is right at an edge somewhere.
But most likely the leak is right at an edge somewhere.