What was found
ON FINAL APPROACH - CHECK FIRE DETECT WARNING - RAN CHECK LIST APU FIRE BOTTLE INDICATES LOW. LANDING UNEVENTFUL. REMOVED FROM SERVICE. PLACED ON MEL 26-20-1. RETURNED TO SERVICE. MEL CLEARED 3/12. FOUND PINS ON 2600 J12 OF APU BOTTLE CONNECTOR FOR PRESSURE SWITCH TO BE CORRODED. INSPECTED 2600-P12 NO DEFECTS NOTED_ REF WM 26-23-00. R&R'D APU FIRE EXT. BOTTLE REF. AMM 26-23-01-000-801 & 26-23-01-400-801. OPS TEST GOOD. M PROC REVERSED. THIS CLEARS MEL/DMI. RETURNED TO SERVICE.