As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SMOKE ALERT SOUNDED IN LAVATORY E. ASSOCIATED LIGHT DID NOT ILLUMINATE. EY OR ABOVE DOOR PER CREW THERE WAS A PASSENGER IN THE LAV WHEN DETECTOR ALERT WAS HEARD. CREW DID NOT SMELL ANY SMOKE. CREW FELT PASSENGER MIGHT HAVE USED HAIR SPRAY OR BODY SPRAY CAUSING THE ALARM. PERFORMED SMOKE DETECTOR TEST IAW AMM 26-14-00-710-801. ALL INDICATIONS NORMAL. THERE IS NO OTHER INDICATION ON THIS FLEET TYPE OUTSIDE OF THE IMMEDIATE LAV.