As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS NOT GROUNDED: LAVATORY L SMOKE DETECTOR WENT OFF FOR 5-10 SECONDS WHILE NOT OCCUPIED WITH NO SMOKE OR FIRE PRESENT. CLEARED AFTER AROUND 10 SECONDS. MAINTENANCE ACCOMPLISHED A SATISFACTORY BITE CHECK PER AMM 26-17-00 WITH NO FAULTS NOTED.