When Player Piano Company was in question, I finally found
a replacement suction pump that was not only quieter but an extremely
better design.  If memory serves correctly, they are around $270.
See http://www.pianoproservice.com/bergytone.shtml 

I have used about four of his pumps with great success.  One of the
best points is that the initial suction outlet is in a corner, so you
can circle it around to make the best fit.

Relating to above, since the initial outlet is in the corner, if needed
one could add outlets for other supporting functions.  Another feature
is that the space between the outlet and the top of the motor has extra
space to aid in a quieter pump.

Duaine Hechler
Florissant, Missouri
http://www.hechlerpianoandorgan.com/