As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CRUISE A VERY STRONG VIBRATION WAS FELT IN THE CABIN BETWEEN SEAT ROWS 9 AND 11. EMERGENCY DECLARED. LANDING UNEVENTFUL. MAINTENANCE FOUND RIGHT AIR CONDITIONING PACK INLET DOOR HINGES EXCESSIVELY WORN. REMOVED AND REPLACED RIGHT RAM AIR INLET DOOR AND HINGES IAW AMM 21-52-20. OPS CHECKED GOOD. AIRCRAFT WAS GROUNDED.