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remember the pressure is approx 3000psi
only while it is contained in its reservoir, not after it leaks
I would hope the reservoir had a LOT less than 3000psi in it!!
Most airliners are now using 4000 or even higher, to save weight.
The hydraulic system will not have enough flow to cause the door to pop off, but a compressed air system might, but I don't think the 757 uses one, in that area at least.
A catastophic failure of an outflow valve might give enough over pressure!