As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
A HOT DUCT ODOR WAS NOTED FROM THE RIGHT AIR CONDITIONING SYSTEM. THE TEMPERATURE OF THE RIGHT AIR CONDITIONING PACK WAS NOTED TO BE 150 DEGREES. BY REDUCING THE TEMPERATURE SETTING, THE TEMPERATURE DECREASED. THE AIRCRAFT RETURNED TO THE FIELD. MAINTENANCE INSPECTED AND DEFERRED THE RIGHT AIR CONDITIONING SYSTEM AND RETURNED THE AIRCRAFT TO SERVICE. ON 02/03/01 MAINTENANCE INSPECTED AND REPLACED THE RIGHT AUTO TEMP CONTROLLER IAW DC9 MM 21-60-00.