As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LAV SMOKE ALARM WENT OFF FOR APPROXIMATELY 1 MINUTE IN FLIGHT. REMOVED FROM SERVICE. REMOVED AND REPLACED LAV SMOKE DETECTOR. REF AMM TASKS 26-12-11-000-801, AND 26-12-11 400-801. OPS CHECKS OK. NO DEFECTS NOTED. AIRCRAFT RETURNED TO SERVICE.