I used to work on hydraulic test stands in the Air Force. With the bang sound, I would think you should be able to visually see where a line ruptered or something like that. Usually the hydraulics have o-rings at the connection point. If you don't see a ruptered line or something similar check the O-ring at the conection. When you put the lines back together don't use tephlon tape, hydraulic fliuid makes it a gummy mess.
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