As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CLE TO RDU - DURING CLIMB-OUT AT APPROXIMATELY 800 FT, CREW RECEIVED A LAV SMOKE EICAS MESSAGE. THE FLIGHT ATTENDANT CHECKED THE LAVATORY AND REPORTED NO SIGNS OF SMOKE, FIRE OR HEAT. THE APPROPRIATE CHECKLISTS WERE FOLLOWED AND THE AIRCRAFT LANDED BACK AT CLE WITHOUT INCIDENT. MAINTENANCE INSPECTED THE AIRCRAFT AND FOUND NO DEFECTS. THE LAVATORY SMOKE DETECTOR WAS REPLACED, AND THE AIRCRAFT WAS RELEASED BACK TO SERVICE.