As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ASH 7073 RDU-ORD. THE AIRCRAFT WAS RETURNED TO THE FIELD DUE TO THE ODOR OF SMOKE IN THE CABIN. UPON LANDING THE CREW REPORTED A LEFT PACK OVER HEAT MESSAGE. CONTRACT MAINTENANCE VERIFIED THE ODOR OF SMOKE BEING GENERATED BY THE LEFT PACK AND PLACED THE LEFT PACK ON DEFERAL. MX REPLACED THE ACM, OPS CHECK GOOD.