As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMB, THE AIRCRAFT EXPERIENCED VIBRATIONS AND THE NR 1 LEADING EDGE FLAP NEEDED TO BE RAISED ELECTRICALLY. AIRCRAFT RETURNED TO NRT AND LANDED WITHOUT INCIDENT. REPLACED THE NR 1 LEADING EDGE FLAP POWER DRIVE UNIT. OPERATIONAL CHECK GOOD. SPECIFIC PART CAUSING FAULT TO BE DETERMINED.