As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FORWARD LAV SMOKE WARNING SOUNDED WHILE ON GROUND AND CEASED SOUNDING ON ITS OWN. NO FURTHER INDICATIONS NOTED. REMOVED FROM SERVICE. PERFORMED A LAVATORY SMOKE DETECTOR SYSTEM TEST/CHECK. TEST GOOD. NO FURTHER DEFECTS NOTED. AIRCRAFT RETURNED TO SERVICE.