As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) IN FLIGHT, LOUD WISHING NOISE FROM CEILING AT ROW 12 AND PASSENGER WERE COMPLAINING ABOUT VERY COLD TEMPERATURE. AFTER INVESTIGATION, MAINTENANCE FOUND A LEAK AT AIR PLENUM AROUND R2/L2 DOOR AREA. LEAK WAS COMING FROM A PREVIOUS REPAIR. PLENUM REPAIRED AND CHECKED SERVICEABLE.