As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AT TOP OF DESCENT EICAS LAV SMOKE MSG ILLUMINATED. MSG CLEARED O N LANDING AS PER CREW SMOKE DETECTOR OPERATED AT AFT L/H LAV K ON DESCENT OF INSPECTED LAV COMP NO SMOKE ODOR NOTED ALL COMPARTMENTS ARE SECURED REMOVED AND REPLACED AFT L/H LAV SMOKE DETECTOR AS PRECAUTIONARY. OPS CHECKS GOOD.