As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AT FL 330 CABIN ALTITUDE WARNING SOUNDED, INITIATED EMERGENCY DESCENT. CABIN WAS AT 10,000 AND CLIMBING. DURING DESCENT HAD LEFT AIRCONDITIONING INOP LIGHT. UNABLE TO MAINTAIN CABIN PRESSURE BECAUSE RT PACK WAS MEL DEFFERRED. LANDED SLC. REPLACED LEFT PACK CONTROLLER AND COMPRESSOR DISCHARGE SENSOR. RETURNED TO SERVICE.