Leaks during rain!
This is a roofer question! And I happen to be the gal! You have a flashing up on the roof that has been damaged by ice most likely. You will see this leak in the winter if snow sits around any flashings on that side.
You probably want to get up on the roof, check all of your flashings, water will travel. you have to get a wire brush or something to sand, or scrape the oxidation off of the aluminum surface then you can caulk with a sik a flex, or a flexible caulking.
Metal will contract and expand with heat and cold changes, but if you do not remove the old caulk, and the oxidation, the new caulk will fail almost immediately.
People can never get their rain gutters to stop leaking because they either do not clean the area, and scrape it up so the caulk will stick, and you must smear the caulk, if you leave it in a bead the ice, and expansion and contraction will roll the caulking.
Good Luck.
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