As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF HAD BURNING ODOR AND VISIBLE SMOKE, RETURNED HNL. RAN ALL ENGINES, COULD NOT DUPLICATE. RAN PACKS, ALL NORMAL. REPLACED NR 3 WATER SEPARATOR BAG. DUE TO HISTORY SUBSEQUENT MAINTENANCE FOUND FAULTY NR 2 PACK RAMA AIR DOOR ACTUATOR. REPLACED ACTUATOR.