Hi comrades of the lightning!! Have a problem there. When I start my Pampersbomber I hear as the compressor approaches and pumps. The thing is only the back something hissing and the dampers don’t move. Do you have any idea what that could be.??? Have searched for everything but found no leaks. And one more. Have read when I change the dampers behind that I should pump them up to 0.8 bar!!! HOW?? and WOMIT?? Greetings