As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AT 4:35 INTO FLT FORWARD LAVATORY SMOKE DETECTOR ACTIVATED FOR APPROXIMATELY 5 SECONDS. CONFIRMED WITH FLIGHT ATTENDANTS THAT THEY HEARD IT. CONFIRMED NO SMOKE. LAVATORY WAS UNOCCUPIED. PERFORMED LAVATORY SMOKE DETECTOR SELF TEST IAW AMM 26-14-00-710, OPERATES AS DESCRIBED. OK FOR SERVICE.