My 1981 Hunter 27 is on the hard and taking on water when it rains. For sure, the water is not coming in through the hatches or ports. I tested the cockpit drains, the anchor well drain, and the deck scuppers, and they don't appear to be leaking. I'm guessing it's the deck/hull joint or stanchions (if anybody has other places to look, please speak up!).So, given that the liner hides most of the stanchion mounts and the entire deck/hull joint, how can I find out if that's the source of the leak and what can I do about it?