Once in a while I get water running down the back wall of the aft berth. This is the only leak. It soaks into the mattress and gets your feet wet. I'm thinking its coming from the cockpit drain. It looks like it was a tube that runs through the overhead berth liner to the lazeret. The water seems to drip from the headliner for the cockpit. Anyone have this issue? I've had this boat for 8 years and have sealed all other leaks. This one is a bit perplexing.