What was found
LSE - FLT 4230 - NR 2 CARGO EXTINGUISHER LIGHT ON. CHECKED BIN AREA AND AIRCRAFT OPERATED TO ORD PER MEL AUTHORITY. REMOVED AFT CARGO NR 2 FIRE BOTTLE FOR WEIGHING. CHECKED FOR DISCHARGE LEAKAGE. PERFORMED FUNCTIONAL TEST OF LOW LEVEL LIGHT IAW SAAB 340B MM 26-23-00. LEAK CHECK GOOD AND FUNCTIONAL CHECK GOOD. REINSTALLED SAME BOTTLE IAW SF 340 MM 26-23-10, AND REPLACED NR 1 AND NR 2 SMOKE DETECTORS AS PRECAUTIONARY. AIRCRAFT RETURNED TO SERVICE. (X)