To respond to Roger Waring who wrote about floor heating as affecting
a Duo-Art, I would suggest getting a good hygrometer, also called a
humidity meter.  Perhaps the pouches have not shrunk -- it might be
that the wood shrinkage caused by lack of humidity has opened gasket
leakage.

Also,  I think that putting a rug under the piano is a good idea as it
will keep much of the hot air rising off the floor away from the piano.
Of course, once the rug gets warm you are back where you started, but
if the heat is not on continuously -- and it shouldn't be -- then the
rug will help.

Although hygrometers can be obtained easily, I suggest that you do not
buy them as they will not be accurate.  I used to be frustrated that
even two of the same hygrometer model gave different readings.  I went
on the Internet and found some scientific hygrometers that give
consistent readings.

Randolph Herr