As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE RIGHT PACK WAS NOISY AND CAUSING A VIBRATION IN THE FORWARD CABIN DURING THE FLIGHT. THE AIRCRAFT DIVERTED TO JFK. *S/D* THE NOISE AND VIBRATION WAS CAUSED BY A LOOSE FLAPPER IN THE SUPPLY FAN CHECK VALVE. THE CHECK VALVE WAS REPLACED PER MM 21-58-02, OPERATIONS CHECK NORMAL.