What was found
AFTER NR 2 ENG START AND TAXI OUT OF GATE CREW NOTICED THE APPEARANCE OF SMOKE IN THE COCKPIT AND IN CABIN. AIRCRAFT RETURNED TO GATE AND MAINTENANCE DISPATCHED. MAINTENANCE INSPECTED RT GENERATOR AND FOUND RESIDUAL OIL. CLEANED OIL AS REQUIRED. PERFORMED VISUAL INSPECTION OF RT ENG COMPARTMENT AND OIL LINES. CLEANED ALL RESIDUAL OIL IN RT ENG COMPARTMENT. CHECKED OIL CONNECTIONS AND FOUND SCAVANGE SCREEN OIL FITTING AT ACCESSORY CASE NEEDED TO BE TIGHTENED. PERFORMED INSPECTION AND OPERATIONAL CHECK OF CABIN VENT BLOWERS. NO DEFECTS NOTED. RAN NR 2 ENG AND ALL SYS CHECK GOOD. RAN NR 1 AND NR 2 ENG WITH NO DEFECTS. COULD NOT DUPLICATE. AIRCRAFT RETURNED TO SERVICE. NO OTHER REPORTS AS OF THIS DATE.