Chain Locker Joint
Dick caught one of the spots which is a typical culprit (and also the U bolt), but another may be the joint between the top of the chain locker pan and the hull. Imagine water running down the furler line and into the deck lead hole and then running along the underside of the deck. If you ever beat into a sea and noticed water in the V-berth this is the probable path it was taking, that is, over the top of the chain locker pan.