As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PRES/ATB/DE - TO SAL DUE TO PRESSURIZATION ISSUE. PERFORMED EMERGENCY DESCENT. PASSENGER OXYGEN MASKS DEPLOYED. CORRECTIVE ACTION: FWD TO MEL 36-11-02. T/S R/R FAN AIR VALVE, LT ENG 450 SENSOR, LT ENG HIGH STAGE PILOT, LT ENG FAN AIR TEMP 380 SENSOR, LT ENG AIR SUPPLY PRECOOLER AND REPLACED SENSE LINE BETWEEN HPSOV & CONTROLLER. ENGINE BLEED SHIFT NORMAL & TEMPS WITHIN LIMITS.