I have had a similar issue where droplets of water would form inside the LCD window. Really not sure how and why that happened. Maybe the camera was not handled properly when passing on to the boat or maybe while traveling( i always carry it as cabin luggage in my haversack). There was no discernible crack but water was getting in, albeit at a very slow rate. i sent the housing (Nauticam for Canon7D) to the dealer and Nauticam Replaced the LCD plexiglass. Post that no issues.