As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LOSS OF CABIN PRESSURE OCCURRED DURING CRUISE FLIGHT AT 33,000 FEET EN ROUTE. CREW ACCOMPLISHED EMERGENCY DESCENT AND FLIGHT WAS DIVERTED TO MKE. AIRCRAFT LANDED WITHOUT INCIDENT. MAINTENANCE REPLACED LEFT AUGMENTATION VALVE AND BROKEN LEFT ENGINE ANTI-ICE DUCT, OPERATIONAL CHECK NORMAL.