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 SMOKE MESSAGE INFLIGHT INDICATED 2 TIMES AND WENT AWAY AFTER A FEW SECONDS. NO INDICATION OF SMOKE FOUND. FLIGHT ATTENDANT PANEL ALSO CLEARED OF MID LAVATORY REPORT. UNABLE TO DUPLICATE THE MALFUNCTION. ACCOMPLISHED OPERATIONAL CHECK OF LAVATORY SMOKE DETECTION SYSTEM, IAW AMM 26-17-00. ALL TESTS NORMAL.