#1541 BCU fault(Train Prep). ~~~~~ CHECK FOUND #1541 TIMS DISPLAY INDICATE AIR SUSPENSION FAULT.CHECK FURTHER FOUND AIR SUSPENION DRAIN VALVE NEAR BOGIE 2 LEAKING.INSPECT THE VALVE FOUND MECHANISM INSIDE STUCK CAUSING LEAK.DISMOUNTLE VALVE AND SERVICE AND LUBRICATE FIX BACK AND TEST AND MONITOR NO LEAK FOUND.CONDUCT BRAKE CYCLIC TEST NO BCU FAULT DUPLICATE.BRAKE PRESSURE ABLE TO ACHIEVE NORMALLY.PARKING BRAKE TEST PASS.JIMMY/IBRAHIM 25.11.2021