As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE CREW REPORTED THAT THE LAVATORY SMOKE EICAS MESSAGE KEPT GOING OFF FOR MOST OF THE FLIGHT. MAINTENANCE INSPECTED THE ACFT AND CLEANED CORROSION FROM THE CONNECTOR, OPS TESTED THE SYS WITH NO DEFECTS, AND THE ACFT WAS APPROVED FOR RETURN TO SERVICE.