As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LAVATORY SMOKE ON EICAS AFTER TAKEOFF. PERFORMED LAVATORY SMOKE TROUBLESHOOTING IAW FIM 26-14-00-810-802-A. CLEANED LAVATORY SENSOR AND RAN ENGINES AT HIGH POWER AND COULD NOT DUPLICATE. NO DEFECTS NOTED AT THIS TIME. ACFT WAS APPROVED FOR RETURN TO SERVICE.