As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT 6159, MKE TO CVG - DURING TAKEOFF CLIMB AT 1,000 FT, THE FLIGHT CREW RECEIVED A LAV SMOKE EICAS WARNING. THE QRH WAS FOLLOWED AND THE AIRCRAFT RETURNED TO LAND. THE FLIGHT ATTENDANT CONFIRMED THAT THERE WAS NO SMOKE OR FIRE. MAINTENANCE RAN THE ENGINES WITH THE FLIGHT CREW WITH NO FURTHER OCCURRENCES AND THE LAV SMOKE DETECTOR WAS DEFERRED. THAT EVENING THE DEFERRAL WAS CLEARED WHEN THE LAV SMOKE DETECTOR WAS REPLACED.