As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: LOUD NOISE AT 1L CABIN ENTRY DOOR. SQUEAL / NOISE STARTED AT 4400 FEET. EMERGENCY DECLARED; FLIGHT RETURNED TO BCN LANDING SAFELY. **SUPPLEMENTAL REPORT FOR AALA202209209620: REMOVED DAMAGED SEALANT FROM 1L DOOR MIDDLE UPPER SEAL DEPRESSOR AND INSTALLED SERVICEABLE SEALANT PER SOPM 20-50-19. SATISFACTORY PRESSURIZATION TEST ACCOMPLISHED PER AMM 05-51-21.** (CLOSED)