Dang JimNM, sorry to hear about your troubles. Do post how it goes. Very interested in hearing and learning about your repair outcome.
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Have you checked out the Xisico video on maintaining it? There is mention is some sort of ball valve on the bottom that can get gunked up and need a cleaning. That could be it???
Did you find that your ball valve was gunky? I have cleaned mine twice, and after more than a year still pumps like a champ.