When repairing a player piano you want to trace the vacuum lines from
the source to the stack.  You'll need a vacuum gauge that can measure
the level of vacuum and try and determine where you're losing your
suction.  I'm assuming that the stack is operating and hasn't been
damaged in the move, though that may be a source of concern.

Start that the input vacuum supply to the expression regulator for your
Duo-Art.  What is the vacuum level there?   It should be at least 40
inches.  Then look at the vacuum levels of the treble and bass side of
the output of the regulator.  They should be 7 to 8 inches in 'Soft'
mode.  You can also set different dynamic levels and check them as well.

I suggest disconnecting the stack and locking both sides and checking
the regulated vacuum output.  If this vacuum level is all good, connect
one side of the stack and measure the vacuum across the stack.  This
is done by checking the vacuum level at the input and then checking the
vacuum level to the tracker bar.  There should be a very, very small
vacuum drop across the stack.  Do this for both sides.  Hopefully,
somewhere along the line, you will find the source of your problem.

It's always best to do this with a tubing diagram for the Duo-Art.
If you don't have a copy, there is a tubing diagram for the diet
Duo-Art that I scanned on the MMD website archives.

Eli Shahar