As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMB-OUT FROM ATL-PFN, AT APPROXIMATELY 10,000 FT THE CREW RECEIVED AN AMBER CABIN ALTITUDE MESSAGE ALONG WITH CABIN ALTITUDE CLIMBING RAPIDLY. THE CAPTAIN LEVELED THE AIRCRAFT OFF TO 10,000 FEET, DECLARED AN EMERGENCY AND RETURNED TO ATL, LANIDNG SAFELY. MAINTENANCE REMOVED AND REPLACED THE CABIN PRESSURE CONTROL SYSTEM OUT FLOW VALVE. OPERATIONAL CHECKS GOOD. AIRCRAFT OK FOR SERVICE. (M)