As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT WING, AFTER FILL PORT REMOVAL, UPPER SKIN UPPER SURFACE FOUND CORRODED AT OVERWING FILL PORT ADAPTER MATING AREA. CORROSION REMOVED AND TREATED PER SRM 51-20-01 AND 51-10-02 REV 112. REPAIR WAS CARRIED OUT IAW EA F-5730-T0310960 PT1 . REPAIR CLASSIFIED AS MAJOR.