3534 Air Discharge sound from underframe ~~~~~ 3534 Air Discharge sound from underframe.  3534 found WFL hose elbow faulty. Replaced with new elbow & checked no air leakage. Air Leak = 0.5 bar/5 mins Cut-in = 8.5 bar Cut-out = 10.4 bar Charge up rate = 1 min 58 sec  Shafie/Lee PT 44496