As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
INDICATION OF LAVATORY SMOKE. INDICATION ONLY LASTED FOR A FEW SECONDS AND THEN EXTINGUISHED. LAVATORY WAS CHECKED AND NO INDICATION OF A FIRE WAS PRESENT. SMOKE WARNING CAME ON A SECOND TIME AND WENT OFF. CIRCUIT BREAKERS PULLED IAW THE CHECKLIST AND RECIRCULATION FAN WAS TURNED OFF. RETURNED TO PQI.