It seems you need to make some minor weatherstripping gutter adjustments. First off you need to see in what area the water is entering. Than take a rubber mallet and hit underneath the gutter. This will raise the metal gutter and help the trunk gasket seal against the trunk lid. I would also glue in the weatherstrip first using 3m black glue. With allot of sheet metal replacement it doesn't take much for the gutter to get bent down. I hope this helps and solves the problem.
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