As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMB, THE RIGHT WING OVERHEAT LIGHT ILLUMINATED. FOLLOWED COCKPIT OPERATING MANUAL PROCEDURES AND LIGHT REMAINED ILLUMINATED. AIRCRAFT RETURNED TO NRT AND LANDED WITHOUT INCIDENT. REPLACED NR 4 PYLON VALVE, NACELLE ANTI-ICE VALVE CLAMP, LEADING EDGE FLAP DRIVE UNIT AIR INLET DUCT SEAL AND ISOLATION VALVE, OPERATIONAL CHECK GOOD.