As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT 6097, CMH TO CVG. AT APPROXIMATELY 800FT, THE CREW REPORTED A LAV SMOKE EICAS INDICATION AND THE LAVATORY SMOKE DETECTOR WENT OFF. THE AIRCRAFT RETURNED TO FIELD AND LANDED WITHOUT INCIDENT. MAINTENANCE FOUND OIL TUBES COMING OUT OF THE DIFFUSER THAT WERE COKED AND THE ENGINE WAS REPLACED.