Snap:Loud hissing sound, like gas leakin ~~~~~ Snap: Loud hissing sound, like gas leaking. CE : 3544 very lound hissing sound coming from bogie 1 undercarriage.  3544 found wheel flange lubricator tube dislodged. Re-installed the tube to its original location. Security/function check - OK.  Irwan Masop 44978