As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 4930 FLIGHT CREW REPORTED AFTER TAKE OFF LAV SMOKE WARNING INDICATION AND DECLARED EMERGENCY AND WAS CANCELLED AND RETURN TO BLOCK WHERE MX PERSONNEL PERFORMED A HIGH POWER ENGINE RUNS AND A SMOKE DETECTION SYSTEM ADJUSTMENT TEST. OPS CHECKED SATISFACTORY AND ACFT WAS RELEASED TO RETURN FOR SERVICE.