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 LAVATORY SMOKE MASTER CAUTION ON SIX PACK OVERHEAD LIGHTS IN CRUISE FLIGHT. MAINTENANCE ACCOMPLISHED LAVATORY SMOKE DETECTOR SYSTEM TEST PER AMM 26-14-00 ON ALL LAVATORIES. NO FAULTS NOTED AND PERFORMED SATISFACTORY OPERATIONAL CHECK.