3506-AIR LEAK FROM UNDER CARRIAGE BOGIE ~~~~~ 3506 - AIR LEAK FROM UNDER CARRIAGE BOGIE #1 DURING DT CHECK.  3506 air leak heard from Bogie #1 U/F. Found #3506 B/S WFL actuator air leaking. Replaced with new spare & function test - OK. Air leak test = 0.4 bar/5 min.  Helmi/Abdillah/Lee KH 44409