Hello, it has been a few years since I last worked on a Baldwin, but
what you wrote is strange.

1) If valves leak on the inner seat, the pumping is really hard because
the system leaks -- it pulls in air past the inner seat.  However, that
air will come through the outer seat, from the atmosphere and it will
_not_ cause the pneumatics to close.

So you have a different problem.  Your valves are partially opening
in that the stem lifts and partially opens the inner seat but also is
partially closing the outer seat.

Assuming you have clearance between pouch and valve, you have a problem
in the pouch cavity side.  The pouch is inflating and lifting the valve
a bit.  Why?  I do not know but the following are issues you should
consider:

1) Little or no vacuum to the bleeds.

2) A leak to atmosphere, on the bleed side or the pouch side, due to
a crack or missing gasket, etc.

Test this by sucking either on a tracker hole or tube.  The valve should
close and the pneumatic should open.  Let us know.

Cheers,

Bernt Damm
Sydney