As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS NOT GROUNDED. LAVATORY 4F-L SMOKE DETECTOR SOUNDED SMOKE LAVATORY ENGINE INDICATING CREW ALERTING SYSTEM MESSAGE, NO SMOKE VISUALLY SEEN. PERFORMED FIM 26-14-00 FOR SMOKE DETECTED LAV 4F-L. NO FAULTS, NO MESSAGE. PERFORMED OPERATIONS TEST LAVATORY SMOKE DETECTION SYSTEM, PER AMM 26-13-00, NO FAULTS.