Cochise, there's a bunch of plastic stripping on the roof and sides. They use it cover seams and on the edges. In my case the caulk had pulled away from these plastic strips. It still held ok on the aluminum panels, but when I found a loose spot (sometimes with a gap up to 0.5 mm between the plastic and caulk), I could usually grab it and peel off a long strip of caulk. Think I pulled out 20-30 feet.
Not sure what's going on, but I do know some plastics have a mold release agent that has to be washed off before you can stick anything to it.
And yes, my main leak was along the edge, close to the door. There was a slight depression there that allowed the water to puddle on the roof and get up over the caulk and into the gap between the caulk and plastic.
To check my caulk, I wear a leather work glove and lightly rub the caulk. If it pulls away, then out it comes.
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