As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DEFECT - IN-FLIGHT LEAK FROM LEFT WING. FOUND 9 LOOSE FASTENERS ON INBOARD END OF FUEL ACCESS PANEL NR 15 ON LEFT WING. SUSPECT IMPROPER TORQUE OF FASTENERS DURING LAST HEAVY MAINTENANCE VISIT. RE-TORQUED FASTENERS IAW BOEING MM 28-11-21. ADDITIONALLY, MARKED FASTENERS WITH ALIGNMENT MARKS TO AID VISUAL INSPECTION. RE-FUELED AIRCRAFT. NO FURTHER LEAKS NOTED.