As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EMERGENCY DESCENT DUE TO LEFT PACK FAILURE. FLIGHT DIVERTED. FOUND EQUIPMENT COOLING VALVE STUCK IN OPEN POSITION-FAILING HULL CHECK. REPLACED EQ COOLING VALVE, ALSO REPLACED POSITIVE PRESSURE RELIEF AND OUTFLOW VALVE ACTUATOR AS PRECUATIONARY.