Staff (CCK) feedback loud air dischargesound at rear DT. TC checked and found MR pressure to be sta ble at 9.5 bars. Staff (KRJ) checked and confirmed that air discharge sound was loud. ~~~~~ #3508 Found B/S WFL elbow dislodged and replaced. Air leak test 0.5/5min, using digital gauge. Function test on WFL-ok. Done by Gopal/Khalid. 06/11/20. To check all cars for air leak. #507/508 air leak test 0.5bar/5mins within range. No leak detected. Checked by Kalees/Sateesh. 06/11/20.