As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LAVATORY SMOKE LIGHT ILLUMINATED ON MASTER WARNING IN FLIGHT. COMPLETED QRH. NO EVIDENCE OF SMOKE OR FIRE FOUND IN LAVATORY. LIGHT REMAINED ON UNTIL SHUTDOWN. REMOVED AND REPLACED LAVATORY SMOKE DETECTOR IAW SAAB MM 26-13-10, PN 72-111211-000; SN OFF: A2707, SN ON: A2067.