As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF FROM VHHH EICAS MESSAGED TIRE PRESSURE, CREW ON BOARD TERMINATED FLIGHT, DUMPED FUEL, RETURNED AND LANDED SAFELY BACK TO VHHH. MAINTENANCE CREW ON GROUND INSPECTED MAIN WHEELS AND FOUND NR 12 WHEEL TIRE WITH ZERO PRESSURE DUE TO FOD TO TIRE TREAD CAUSED BY A SCREW. REMOVED AND REPLACED NR 12 AND ADJACENT NR 11 WHEEL ASSEMBLIES IAW B-777F AMM 32-45-01. CORRECTED TIRE PRESSURE, AND RESTORED AIRCRAFT TO NORMAL.