As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER START OBSERVED ZONE TEMP FOR CONTROL CABIN AND AFT CABIN ILLUMINATED. THE AFT SUPPLY DUCT FAILED TO RESPOND TO TEMP SELECTOR MOVEMENT TO HOT OR COLD. ACFT GROUNDED. RECYCLED AIRCRAFT POWER IAW AMM 24-00-00. CHECK NORMAL. AIRCRAFT OK FOR SERVICE.