Staff(PNR) feedback Transit Security Personnelheard loud hissing sound at car 3549. TC confirmed M R pressure was 10-11 bar and no other fault indication was o bserved. Staff(TWR) checked and confirmed loud hissing sound ~~~~~ CHECK CONFIRM LOUD HISSING SOUND #3549.FURTHER CHECK FOUND WHEEL FLANGE LUBRICATOR AIR HOSE DISCONNECTED FROM ELBOW CONNECTOR SECURE CHECK DONE OK.LEAK CHECK DONE OK,NO LEAK DURING OCCUPIED AND ONOCCUOIED CAB.AIR LEAK TEST 0.4 BAR/5 MINUTE.JIA WEI/AKHBAR/RAM 20.09.2021