As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
VERY LOUD NOISE AT DOOR 2R AREA DOES NOT APPEAR TO BE A LAVATORY VLV STUCK SOUND LIKE SUCKING TYPE SOUND, POSSIBLY DOOR SEAL BUT CREW UNABLE TO DETERMINE LOCATION OR CAUSE. CREW STATES NO VIBRATION NOTICED FOUND LOWER AFT SECTION OF DOOR SEAL CAUGHT IN SLIDE GRIT BAR MECHANISM. RELEASED SEAL AND INSPECTED SEAL. NOT DEFECTS NOTED. OPENED AND CLOSED DOOR WITH NO FURTHER FAULTS NOTED.