As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ACFT RETURNED, DUE TO SMOKE IN THE CABIN. THE ACFT WAS SENT TO THE HANGAR AND MX PERFORMED RT ENGINE CLEANING PROCEDURE IAW AMM 72-00-00 AND AIR PRESSURIZATION OPS TEST IAW AMM 21-31-00, ALL CORRECT. THE OVERWEIGHT INSP WAS NOT NECESSARY DUE TO THE ACFT LANDED WITH 53,500 KG AND THE MAXIMUM LANDING WEIGHT IS 58,059 KG.