My 1995 Hunter 336 has a dorade box aft of the mast on the cabin roof. It leaks when I wash down my deck and in heavy rain. It is not coming thru the vent top opening, but rather from, what I imagine to be, the dorade box that is inserted into the roof itself. This box is under the deck covering that covers the box and halyard lines. Anyone who has been through the process of fixing this type of thing, I would appreciate insight on how to fix, and what parts I need. Thanks