As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS NOT GROUNDED: IN CRUISE AT FL 340 SMOKE DETECTOR AURAL ALERT MOMENTARILY. NO SMOKE FOUND IN LAVATORIES. MAINTENANCE ACCOMPLISHED A SATISFACTORY OPERATIONAL CHECK OF THE LAVATORY SMOKE DETECTION SYSTEM WITH NO FAULTS NOTED.