As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
VIBRATION NOTED OVER LT WING FUSELAGE. RETURNED TO AIRPORT. NORMAL LANDING. FOUND LT WING EXIT HATCH, DROP DOWN STEP HINGE PIN MIGRATED LOOSE. REINSTALLED HINGE PIN AND SECURED. ACCOMPLISHED ETOPS 1. OPENED AND CLOSED AFT NR 1 ENG CORE COWLS MM 05-51-38 MM 52-21-01.