As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT RETURNED TO FIELD DUE TO LIGHT SMOKE REPORTED IN CABIN. THE SYSTEM WAS TROUBLESHOT AND THE RIGHT TEMP CONTROL VALVE WAS DETERMINED TO BE AT FAULT. THE UNIT WAS REPLACED AND A FUNCTIONAL CHECK OF THE SYSTEM PERFORMED WITH ALL INDICATIONS NORMAL. (M)