As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS NOT GROUNDED. FORWARD LAVATORY SMOKE DETECTOR ALARMED WHILE IN CRUISE. IT RANG ABOUT 4 TIMES THEN WENT AWAY. NO EVIDENCE OF ANY SMOKE. NO ONE IN THE LAVATORY AT THE TIME OF INDICATION. ACCOMPISHED TSM 26-17-00-810-821. NO FAULTS NOTED.