As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AT FL330 GOT CABIN ALT WARNING AND CABIN AUTO INOP CAUTION. DECLARED AN EMERGENCY AND DESCENDED TO 10,000'. CABIN PRESSURE REACHED 11,000'. MASKS DID NOT DEPLOY. FLT RETURNEDTO ATL AND LANDED WITHOUT INCIDENT. REPLACED BLOWN BOOT IN RIGHT ECS BAY, OUTFLOW VALVE ACTUATOR ASSEMBLY, AND BOTH CABIN PRESSURE CONTROLLERS.