As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED A LAVATORY SMOKE MESSAGE ON EICAS AFTER TAKE OFF. THE ACFT LANDED WITHOUT INCIDENT WHERE MAINTENANCE INSPECTED THE ACFT, LAV WIRING WITH NO DEFECTS NOTED, R & R FOUR FLUORESCENT LIGHT BULBS AS A PRECAUTION AND THE ACFT WAS APPROVED FOR RETURN TO SERVICE.