As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE CREW REPORTED A LAV SMOKE CAS MESSAGE AND RETURNED TO THE GATE. MAINTENANCE INSPECTED AND CLEANED THE LAV DETECTOR CONNECTOR IN ACCORDANCE WITH DORNIER MAINTENANCE MANUAL 26-00-00. OPERATIONAL CHECKS WERE PERFORMED AND THE AIRCRAFT WAS RELEASED FOR SERVICE.