Look "up" first unless you're certain it's coming through the door. My antenna crank is leaking and water is traveling behind the inside skins and pooling under the fold up table and at the door. If it is the door, check the weatherstripping. You can put a piece of paper between the door and the frame and close the door. Tug gently and it should pull out, with some resistance. Repeat. On a windy way go in with incense (etc) and watch the smoke. It could be the hinges too. Most of them are adjustable. My lower one has a stripped bolt, so I will need to replace it, which means pulling the interior skins. Good luck!
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