As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE CREW RECEIVED A LAV SMOKE CAS MESSAGE AND CALLED MAINTENANCE. MAINTENANCE DEFERRED THE LAV SMOKE DETECTOR WITH THE CREW. UPON ARRIVAL AT PIT, MAINTENANCE INSPECTED AND REPLACED THE LAV SMOKE DETECTOR IN ACCORDANCE WITH DORNIER MAINTENANCE MANUAL 26-00-00, OPERATIONAL CHECKS WERE PERFORMED AND THE AIRCRAFT WAS RELEASED FOR FLIGHT.