As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS NOT GROUNDED: 30 MIN FROM LANDING, RECEIVED LAVATORY SMOKE EICAS MESSAGE. INSPECTED LAVATORY FOUND LAVATORY CONDITIONS NORMAL. ACCOMPLISHED AMM 26-13-00 FOR LAVATORY SMOKE EICAS MESSAGE. OPERATIONAL CHECK NORMAL WITH NO DEFECTS NOTED AT THIS TIME.