As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMB, LOST FLUID FROM THE NR 4 HYDRAULIC SYSTEM AND THE OUTBOARD FLAPS DID NOT RETRACT. DECLARED AN EMERGENCY AND THE AIRCRAFT RETURNED TO NRT AND LANDED WITHOUT INCIDENT. TIGHTENED A FLEXIBLE HYDRAULIC PRESSURE LINE FITTING ON AFT SIDE OF THE ENGINE DRIVEN HYDRAULIC PUMP IN THE NR 4 PYLON. OPERATIONAL CHECK GOOD.