As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING DESCENT THE CREW REPORTED A LAVATORY SMOKE WARNING ON EICAS WITH NO SIGN OF SMOKE IN LAVATORY. THE CREW DEACTIVATED TWO CIRCUIT BREAKERS IAW THE QRH AND THE ACFT LANDED WITHOUT INCIDENT. MAINTENANCE INSPECTED THE ACFT WITH NO SIGN OF SMOKE OR ODOR DETECTED, REACTIVATED THE CIRCUIT BREAKERS, OPERATIONALLY TESTED WITH NO DEFECTS AND THE ACFT WAS APPROVED FOR RETURN TO SERVICE.