MTS feedback to Duty CC loud air discharge sound from Rear DT car. Staff(TAP) checked, confirmed lou d air discharge sound from Rear DT car. TC feedback MR at 10bars ~~~~~ 3712 MTS feedback to Duty CC loud air discharge sound heard. Staff(TAP) confirmed loud air discharge sound from Rear DT car. TC feedback MR at 10 bars. CE 3712 checked & found no sign of any air discharge sound. MR at 10bars. Depot pls follow up any 3712 abnormal air discharge sound.  3712 found WFL magnet v/v tube dislodged/damaged. Replaced the elbow joint, trimmed the tube & reinstalled. Security/function check - OK. Checked #3712 air dryer 2 min change-over purge - OK. No abnormal air discharge found on #3712. Pneumatic system test :                         3711              3712 Cut-in :                8.8 bar           8.8 bar Cut-out :               10.4 bar          10.4 bar Charging Rate :         2 min 15 sec      2 min 15 sec  Irwan Masop 45041