We had several leaks when our unit was new. If you have a lot of crud built up, it's probably best to remove the window, clean it, and recaulk around the top and sides. Be sure to check to see if the drain holes are open and are facing down. We had one window where the rubber seal had been cut too short, allowing the water to run into the inside window groove. I simply caulked the gap in the rubber seal to fix the problem.
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