As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED LOSS OF PASSENGER CABIN HEAT IN FLIGHT. NO OTHER ABNORMAL INDICATIONS OR MAINTENANCE MESSAGES SHOWN. UPON LANDING, MAINTENANCE FOUND A SPLIT RUBBER VENTILATION DUCT COUPLER BETWEEN THE RT SIDE AIR CONDITIONING PACK AND THE ACFT CABIN. RUBBER CONNECTOR WAS REPLACED AND NO OTHER ISSUES WERE FOUND.