As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT 4974 - DURING TAKEOFF ROLL AT CVG RECEIVED AFT LAVATORY SMOKE MESSAGE ASSOCIATED WITH OILY SMELL IN COCKPIT, CREW DECLARED AN EMERGENCY, ABORTED TAKEOFF AND RETURNED TO THE GATE. PERFORMED LEFT AND RIGHT ENGINE RUNS, DISCREPANCY COULD NOT BE DUPLICATED BY MAINTENANCE.