A leak actually through the foam seal is unlikely (although anything is possible). The most likely leak is through the mounting bolt for the bracket (or hinge) at the bottom corner. These are held by a large screw from the inside, and it is not uncommon for the gasket under the bracket to leak and allow water along the thread into the interior. (it seems to be a high pressure area, and the actual sealing area for the gasket is pretty small - took me a long time to find the problem with mine, and it turned out to be a creased gasket). Consider either replacing the gasket or sealing both sides of it with silicone gasket material.(or both)
John
John
JDNSW
1986 110 County 3.9 diesel
1970 2a 109 2.25 petrol
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