As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS NOT GROUNDED: INTERMITTENT FORWARD LAVATORY SMOKE INDICATION. FLIGHT ATTENDANTS DOUBLE CHECKED ALL LAVATORIES, NO SMELL OR VISIBLE INDICATIONS OF ANY SMOKE. MAINTENANCE PERFORMED SATISFACTORY GROUND TEST OF SDF SYSTEM PER TSM 26-16-00.