As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT NOT GROUNDED: PILOT REPORTS COCKPIT LAVATORY SMOKE ALERT FOR 5 SECONDS IN COCKPIT. NO LAVATORY SMOKE ALARM IN CABIN. LAVS INSPECTED BY FAS. NO SIGN SMOKE OR FIRE. MAINTENANCE PERFORMED LAVATORY SMOKE DETECTOR TEST IAW AMM 26-19-00. NO FAULTS FOUND.