As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) AFTER LANDING AND FLAPS RETRACTED CREW NOTICED THAT INBOARD FLAPS HAD RETRACTED FULLY BUT THE OUTBOARD FLAP HAD STUCK AT ABOUT THE APPROACH SETTING. FLAP GEARBOX/MOTOR ASSY REPLACED. INSPECTION OF FAILED GEARBOX REVEALED NUMEROUS STRIPPED TEETH ON ONE OF THE GEARS.