As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AUS - FLIGHT 1, THE CREW REPORTED A LAV SMOKE WARNING IN FLIGHT. THE AIRCRAFT RETURNED TO AUS WHERE IT LANDED WITHOUT INCIDENT. MAINTENANCE INSPECTED THE AIRCRAFT, OPERATIONALLY CHECKED THE LAV SMOKE DETECTOR WITH NO DEFECTS NOTED, AND THE AIRCRAFT WAS APPROVED FOR RETURN TO SERVICE.