I have a new Beneteau 323. The pump in the head had been working fine until this morning, and after showering this morning the water wouldn't drain. the pump started to make a whinier noise - not sure if this meant the hose would possibly be blocked or if the pump is damaged (already?).. any ideas or thoughts? the valve is open, and there's nothing that should have been able to get in to the drain that could have clogged itthanks!