As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING ETOPS INSPECTION IN PEK THE NR 8 TIRE PRESSURE WAS 18PSI & FLAT. REMOVAL OF THE TIRE REVEALED A FLAT SPOT ON THE BOTTOM. BRAKE CHECK REVEALED THE NR 8 BRAKE HAD LOCKED UP CAUSING THE TIRE TO DRAG & GO FLAT. REPLACED WHEEL & BRAKE.