What was found
AIRCRAFT CARGO COMPARTMENT SMOKE WARNING LIGHT ILLUMINATED DURING FLIGHT EN ROUTE TO IAD. EXTINGUISHER ACTUATED. CREW LANDED AIRCRAFT AT IAD WITHOUT FURTHER EVENT. AIRCRAFT CARGO COMPARTMENT WAS INSPECTED WITH NO EVIDENCE OF SMOKE OR FIRE NOTED. REMOVED AND REPLACED FIRE BOTTLE AND CARTRIDGE. CLEANED AND INSPECTED SMOKE DETECTORS AND SENSORS, NO FURTHER ACTION REQUIRED. NO SYSTEM DEFECTS NOTED. (M)