TC reported EB tripped and unable to reset. MR pressure dropped to 7.8 bars with LMRG fault. TC conf irmed SIR was blinking. Pax was disembarked at DVR WB.Subs equently, MR charged up to 9 bars. EB able to set. Train pro ~~~~~ 3565 TC reported EB tripped and unable to reset. MR pressure dropped to 7.8 bars with LMRG fault. TC confirmed SIR was blinking. Pax was disembarked at DVR WB. Subsequently, MR charged up to 9 bars. EB able to set. L3. L3 3565 Fault permanent in depot. Loud air discharge sound coming from 3566 A/S WFL carbody pneumatic    connector. Air leak 0.5 bar/5 min when #3566 cab occupied. Air leak 1.2 bar/30 sec when #3565 cab occupied. No pneumatic related FC. ER shows occupied cab at time of fault is #3565. #3566 A-side WFL carbody pneumatic connector hose found with a cut, causing connector unable to latch on the hose securely. Re-inserted old hose into old connector, hose easily dislodged. Inserted new hose into old connector, tug test satis, hose did not disconnect. Inspected connector joint grip ring condition - OK. Inserted new tubing into old joint, tug test satis, hose did not disconnect. O-release button not stuck such that hose will dislodge unintentionally. Replaced hose. Preventively replaced #3566 A-side WFL carbody pneumatic connector. Function test WFL able to protract & retract as required. Pneumatic test satis. #3565 Cut in:  8.8 bar Cut out: 10.5 bar Charging rate: 2 min 30 sec #3566 Cut in: 8.7 bar Cut out: 10.5 bar Charging rate: 2 min 40 sec  Sugu/Alan/Anand/Kamarul 45215