What was found
DFW - FLT 3878 - EN ROUTE FROM BTR TO DFW, THE CARGO SMOKE LIGHT ILLUMINATED. THE CREW DISCHARGED NR 1 FIRE EXTINGUISHER PER THE CHECK LIST. SMOKE LIGHT WENT OUT AND THE AIRCRAFT LANDED WITHOUT FURTHER INCIDENT. MAINTENANCE INSPECTED AND FOUND NO EVIDENCE OF SMOKE OR FIRE. REPLACED FORWARD AND AFT CARGO SMOKE DETECTORS. DISCHARGED BOTTLE WAS ALSO REPLACED. REFERENCE: OPERATOR CONTROL NR 96ZZZX4894. (X)