Pax feedback to staff (KTB) unusual noise at rear DT car, TC checked and confirmed no fault found. M R was more than 10bar, staff (YIS) boarded and confirmed his sing sound sound. ~~~~~ 3712 Pax feedback to staff (KTB) unusual noise. (L3) TC checked and confirmed no fault found. MR was more than 10 bar. Staff(YIS) boarded and confirmed hissing sound. L3 3712 found WFL hosedislodged at elbow joint, causing air leaking. Replaced with a new hose & elbow joint. Function test WFL & found air leak - OK. Pneumatic System Test :   #3712             #3711 Cut-in  :                 8.35 bar          8.35 bar Cut-out :                 10.30 bar         10.20 bar Charge-up time :          2min 36sec        2min 10sec Air leak test :           0.2bar/5min       0.2bar/5min  Alan 45094