What was found
UPON TOUCHDOWN AND T/R ACTIVATION THE A-LOOP NR 2 AFT CARGO SMOKE DETECTOR LIGHT ILLUMINATED. QUICK REFERENCE HANDBOOK FOR CARGO FIRE DETECTION/FIRE WARNING LIGHT DID NOT ILLUMINATE. COMPLETED THE CARGO FIRE INDICATION CHECK LIST - BOTTLE DISCHARGED, FIRE OR SMOKE NOT PRESENT IN AFT CARGO PIT. FOUND AIRCRAFT A-LOOP DETECTION LIGHT ON. REMOVED AND REPLACED AFT CARGO A-LOOP, MFG P/N CGAB1400-00. A3 DETECTOR SYSTEM OPERATION CHECK GOOD PER AMM 26-16-10.