As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE THREE LAVATORY SMOKE DETECTOR ALARMS WERE FLASHING AND DID NOT TURN OFF. THE SYSTEM WAS RESET BUT THE ALARM CONTINUED RINGING. DUE TO SUCH A FAILURE, A CHANGE OF EQUIPMENT WAS REQUESTED. THE SYSTEM AND THE SMOKE DETECTOR CONNECTORS WERE CHECKED, AUTO TEST WAS PERFORMED AND IT WAS OK.