What was found
DURING FLIGHT, LOWER AFT CARGO SMOKE AND ARMED LIGHT ILLUMINATE WITH ASSOCIATED BELL. THIS OCCURED 10 SECONDS AFTER WING ANTI-ICE SELECTED OPEN. LIGHT WENT OUT AFTER THE BOTTLE WAS DISCHARGED AND THE SYSTEM TESTED GOOD. REMOVED FWD/AFT CARGO COMPARTMENT LINING AS REQUIRED IAW MM 25-52-002-4. PERFORMED DETAIL VISUAL INSPECTION AT FWD/AFT CARGO COMPARTMENT AREAS FOR ANY DAMAGE. NO DAMAGE FOUND. REMOVED AND REPLACED NR 1 AFT CARGO FIRE BOTTLE IAW MM 26-17-001-5. PERFORMED OPS CHECK LEAK CHECK GOOD IAW MM 26-17-001-5. INSTALLED FWD/AFT CARGO COMPARTMENT LINING IAW MM 25-52-002-4.