As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) FLIGHT CREW REPORTED NO HEAT IN AFT CABIN. INSPECTION OF THE DUCTING IN THE AFT CABIN FOUND TWO DUCTS DEFORMED DUE TO HEAT CAUSING A RESTRICTION OF AIRFLOW TO THE CABIN OUTLETS. NEW DUCTS INSTALLED. TEMPERATURE CONTROL WAS OPERATING IN MANUAL MODE DUE TO FAILURE OF AUTO MODE. (TC# 20090928006)