As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AUTO TEMP CONTROLLER HAD FAILED (AUTO MODE) CAUSING THE SMELL OF HOT AIR AND SLIGHT SMOKE IN THE CABIN. AN ENGINE RUN WAS PERFORMED, CONTROLLING TEMP IN MANUAL MODE, CHECKED OK WITH NO OTHER DISCREPANCIES NOTED. AIR CONDITIONING SYSTEM AND COMPONENTS CHECKED SATISFACTORY. AUTO TEMP CONTROL SYSTEM MEL PROCEDURES ACCOMPLISHED AND AIRCRAFT DEPARTED WITH NO FURTHER PROBLEMS NOTED.