A thought just occured to me. Years ago we had work done on our home. When heavy rains came we had a leak that no amount of caulk/sealant could fix. Turns out that the work had opened a tiny seam allowed water to travel from the roof, down the inside of the wall. The caulk around the window was keeping the water in the wall. The source of the problem was nowhere near where the trouble appeared.
Good luck. Hope you get it fixed.
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