As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE FLIGHT CREW REPORTED THAT THE AIRCRAFT CABIN TEMPERATURE HEAT WAS EXTREMELY HOT AND HARD TO CONTROL AND HAD AN ODOR SIMILAR TO BURNED RUBBER. MAINTENANCE TROUBLESHOT THE CABIN AND COCKPIT TEMPERATURE CONTROLS IAW MM CABIN TEMPERATURE SYSTEM CHECKS. NO DEFECTS WERE NOTED IN THE SYSTEM OPERATION. THE AIRCRAFT WAS RETURNED TO SERVICE.