1978 Hatteras double cabin rainwater leak in aft cabin

[dreamweaver66]

This water leak is driving me crazy. aft cabin Starboard side I have a rain water leak that is driving me nuts. The wall that seperates the aft head and bed it get very wet. Back corner of the starboard side I have water leaking from a screw that holds a wire up. I took the screw out and it leaks bad. From the inside wall to about 12" the inside fiberglass sounds hollow. I sure the wood coring gets wet and iit leaks at the lowest point inside which is from the screw. I have no clue where the water is coming from. I rebedded every screw on the outside deck near this leak. I also found a tube that is a drain on outside deck and goes threw the fiberglass and drain above or near the port window. I used epoxy and closed off the tube. I really need help on this leak. will post picture later

 

[McCaleb]

I have a 38 double cabin with a leak in the same area. I can't find were it is coming from. If you find out please post.