As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
HKG-NRT - AFTER TAKEOFF, THE NR 4 LEADING EDGE FLAP FAILED TO RETRACT IN NORMAL AND ALTERNATE. CREW FOLLOWED COCKPIT OPERATING MANUAL, DUMPED 50,000 LBS OF FUEL AND DIVERTED FLIGHT TO TPE. REPLACED NR 4 RT L/E PDU AND OPERATIONAL CHECK WAS NORMAL.