As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLUSH FUEL CAPS ALLOWING WATER TO LEAK INTO FUEL TANKS. BEING A WET WING AIRCRAFT, IT IS VERY DIFFICULT TO BE SURE ALL WATER IS REMOVED. INSTALLING NEW SEALS OR CAPS IS ONLY A TEMPORARY SOLUTION. PERMANENT FIX IS TO INSTALL STC SA2457CE PLATES AND CAPS OR OTHER TYPE RAISED INLET.