As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED THAT ON DOWN-WIND LEG OF APPROACH INTO ORD, RECEIVED A LAV SMOKE INDICATION ON EICAS. THE FLIGHT ATTENDANT CHECKED AND FOUND NO SIGNS OF SMOKE OR ODOR. THE QRH WAS FOLLOWED AND THE AIRCRAFT LANDED WITHOUT INCIDENT. MAINTENANCE PERFORMED AN OPERATIONAL CHECK OF THE LAV SMOKE DETECTION SYSTEM IN ACCORDANCE WITH EMB140 AMM 26-14-00, WITH NO INDICATIONS OF SMOKE OR ODOR.