As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON FLIGHT 3343, CREW REPORTED STRANGE ODOR IN CABIN. NO SMOKE OR FUMES OBSERVED. ALSO PASSENGER AND FLIGHT ATTENDANT OBSERVED BLUE BLACK SMOKE COMING OUT JUST AFT OF PROP. AIRCRAFT REMOVED FROM SERVICE. REMOVED AND REPLACED LEFT ENGINE IAW WC 72-49-03. LEAK AND OPERATIONAL CHECK GOOD. AIRCRAFT RETURNED TO SERVICE