I had the same problem and thanks to this blog I took care of it myself. The tapping on the expansion tank made it obvious that the tank was full of water. Now that I put the new tank in it is only about half-filled with water as its supposed to be. The new one came pre-charged with 20 psi air and the label said that would be good for most applications so thats where I left it. Its really a quick, simple replacement. Thanks to all for the help.
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