Leaking shower enclosure or shower pan? In our new TT, found water on floor under bath sink that ran under exterior wall and was dripping on the ground through a floor penetration made by a screw that fastened the exterior wall to the floor. Took about an hour of careful observation and wife aiming shower head at different parts of the shower enclosure to locate the source of the leak, which was a combination of poor seal of gasket in shower enclosure frame, and no caulking in the seam created where the ABS wall panels meet the shower pan.