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If you press the air valve on the expansion tank does water come out of it?
If the answer is yes than the bladder is broken and the tank requires replacing.
If not the expansion tank can be recharged with a bike pump. With the water off and faucet open to bleed off the pressure pump up the air bladder to the operating pressure of your system.
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I stayed at a Holiday Inn Express last night.
Now I can Plumb! 
For great information on the history of sanitary sewers including the use of Redwood Pipe
Visit http://www.sewerhistory.org/
Did you know some Redwood Pipe is still in service today.
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