As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) PILOTS REPORT LOUD PRESSURIZATION HOWL COMING FROM THE LAVATORY. INSPECTION REVEALED LAVATORY SERVICE DOOR TORN OFF ALONG WITH DUMP HORN AND FLUSH CONTROL VALVE. FUSELAGE DENTED AT STN 17065 BETWEEN STRINGERS 58 AND 58A. REPAIRED OR REPLACED.