As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) FUEL FOUND LEAKING FROM FUEL DRAIN RETAINING FLANGE AREA. INSPECTION REVEALED THAT 1 RIVET HEAD HOLDING RETAINING NUT PLATE HAD BROKEN OFF. THE NUT PLATE, LOCATED INSIDE THE WING`S FUEL BAY, HAD MOVE, BREAKING THE SEALANT, THUS THE LEAK.