What was found
PERFORMED AN AIR TURNBACK, DUE TO SMOKE IN THE CABIN. IAW LOG 7893748, INSPECTED DOOR AREA HEATERS NTF, INSPECTED ENGINES AT FULL THRUST TAKEOFF POWER WITH ENGINE A/I ON/OFF NTF, INSPECTED ENGINES FOR FLUID LEAKS AND BLEED SYSTEM NTF. INSPECTED 2.5 BLEED PORTS AND SCREENS NTF. INSPECTED RECIRCULATION FANS/FILTERS NTF, REPLACED RT RECIRCULATION FAN AND BOTH FILTERS AS PRECAUTIONARY. RAN PACKS AND PNEUMATICS NTF. INSPECTED CABIN DISTRIBUTION DUCT AND PSU'S NTF. INSPECTED IFE, WI-FI, OVENS AND COFFEEMAKERS NTF. PERFORMED REMOVAL OF OIL CONTAMINATION FROM THE AIR CONDITIONING AND PNEUMATIC SYSTEMS, NTF. NO SMOKE, ODOR NOTED. CONTACTED MAINTENANCE. AIRCRAFT OK FOR SERVICE.