As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) SMOKE AFT LAV WARNING ILLUMINATED SHORTLY AFTER TAKEOFF. EMERGENCY DECLARED. INITIATED RETURN TO FIELD. MESSAGE EXTINGUISHED. MAINTENANCE INSPECTED AREA IN LAV AND FOUND NO EVIDENCE OF SMOKE OR FIRE. RAN ENGINES WITH PACKS ON WITH NO DEFECTS NOTED.