As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMB, THE AFT CARGO DOOR ILLUMINATED AND AIRCRAFT FAILED TO PRESSURIZE. FLIGHT RETURNED TO BKK AFTER DUMPING 5000 LBS OF FUEL AND LANDED WITHOUT FURTHER INCIDENT. MAINTENANCE FOUND THE AFT CARGO DOOR HANDLE OUT OF POSITION. ADJUSTED LATCH AND LOCK. OPERATIONAL CHECK OK.