As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT 1829, DFW-PHL - DESCENDING TO 30,000FT LOUD BANG REPORTED. CABIN ALTITUTE STARTED CLIMBING BUT CABIN ALTITUDE LEVEL AT 9000FT. SOUNDED AS A DUCT LEAK OR DUCT DISCONNECTED. THE CREW DECLARED AND EMERGENCY AND LANDED UNEVENTFULLY. MAINTENANCE FOUND BOOT ON ACM DUCT DISCONNECTED. REINSTALLED AS REQUIRED AND PERFORMED LEAK CHECK PER AMM 21-30-00. OPERATIONAL CHECK IS SATISFACTORY.