As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CRUISE WITH THE AUTO PRESSURIZATION CONTROLLER ON MEL, THE AIRCRAFT EXPERIENCED A LOSS OF CABIN PRESSURIZATION AND THE OXYGEN MASKS DEPLOYED. AIRCRAFT DESCENDED TO 24,000 FEET AND CONTINUED TO NRT AND LANDED WITHOUT INCIDENT. REPLACED THE OUTFLOW VALVE AND AUTO PRESSURIZATION CONTROLLER AND REPAIRED THE FORWARD CARGO DOOR SEAL DEPRESSOR AND PLENUM CHAMBER DRAIN VALVE. OPERATIONAL CHECK OK.