Need to be a Dective
Leaks can be real buggers to find and we can sense your frustration comming through. A couple years ago I had a leak on the starboard side of the forward cabin and the bottom of the hanging locker would always get wet after a good rain. It appeared the water was getting in from around the water tank deck fill fitting and that was resealed. Still the water kept comming. Sealed the screws for the stantions and ditto. Frustration really starting to set in now!The pulpit had a pair of conductors that popped out of a hole in the deck in the chain locker and went inside the tubing. Looking up in the chain locker at the underside of the deck I could see the wires came from the forward cabin overhead. Hummmmm. Even though the wires that went through the deck had a drip loop it could be possible for water to go to the underside of the deck via surface tension, that is, never make it to the drip loop. From there water could travel down the overhead (downhill) into the forward cabin. The overhead would get damp but the fabric cover would mask where the water was coming from. I put some sealant around the wires through the deck and, voila!, the leak has stopped.If you have a chain locker it is very likely just a drop-in pan. Unless the top of the pan, where it is close to the underside of the deck, is sealed (which it probably isn't), water can travel anywhere down the overhead (underside of the deck) and into the forward cabin. Wash the mud and rode with high pressure water and guess where all the splattered water runs? Yup, V-berth.Be persistent and eventually you'll find the culprit.