As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF THE FLIGHT ATTENDANT REPORTED AN EXTREMELY LOUD AIR LEAK FROM THE L1 DOOR. EMERGENCY DECLARED AND DIVERTED. UNEVENTFUL LANDING. INSTALLED L1 DOOR LOWER FLAPPER SPRING IAW AMM 52-11-00 AND ACCOMPLISHED PRESSURIZATION SYSTEM TEST IAW AMM 21-31-00. OPERATIONAL CHECK GOOD. AIRCRAFT WAS GROUNDED.