What was found
INSPECTION TYPE:N/A, AFT LWR CARGO COMPARTMENT FIRE WARNING ACCOMPLISHED LWR CARGO COMP SMOKE DET TEST, CKD OK. THOROUGHLY INSPECTED LOWER AFT CARGO COMP, NO EVIDENCE OF FIRE FOUND. WHEN INSPECTING CGO COMPT HEAT DUCT, FOUND PLASTIC TRASH STICKING TO THE DUCT. TRASH WAS PARTLY BURNED AND MOLTEN CAUSING FIRE ALARM GOING OFF. DEFERRED AFT LWR CARGO HEAT PER MEL.