As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS NOT GROUNDED. LEFT AFT LAVATORY SMOKE ALARMED CREW AT CRUISE. PASSENGER WAS IN LAVATORY AT TIME. NO EVIDENCE OF SMOKE OR AEROSOL PRODUCTS IN USE. ACCOMPLISHED TSM 26-17-00-710-001-A. PERFORMED TEST OF LAVATORY SMOKE DETECT SYSTEM. NO FAULTS FOUND.