As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE CREW REPORTED A LAVATORY SMOKE WARNING AND ODOR OF SMOKE IN THE CABIN. THE ACFT RETURNED TO DEPARTURE AND LANDED WITHOUT FURTHER INCIDENT. MX INSPECTED AND PERFORMED ENGINE RUNS. NO DEFECTS WERE FOUND. THE ACFT WAS RELEASED FOR SERVICE.