FX Fx impact leaking from power wheel

Hello friends, I am Spanish. Forgive my writing errors.
I have a fx impact mk2
with an air loss from the power wheel area. I have assembled and disassembled the rifle completely including the regulator, I have changed some O-rings and everything remains the same. I thought I knew everything about this but I'm really discouraged because I can't find the solution. I hope someone can tell me the solution to the problem. Thank you.

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