Twice now, during a gentle rain, I'll hear a drip and can see a wet spot here. Can't feel where it's coming from above. This is the western side of the place where the extension joins the house. Up on top is some irregular roofing due to house not being quite level, I think. In any case, this spot is under the hip valley where it meets at the bottom.
What's weird is that during heavy rains, no leak.