As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LAVATORY SMOKE AND MASTER CAUTION PANEL ON FOR 5 SECONDS WITH AUDIBLE ALARM FROM AFT LEFT LAV. NO INDICATION OF FIRE OR SMOKE NOZZLE AND TEMP INDICATOR APPEARS NORMAL. INSPECTED AND DID SELF TEST OF SYSTEM NO FAULTS NOTED AT THIS TIME IAW AMM 26-14-00.