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Danfoss resbe mixing valves on radiant system

Hey all, has anyone had experience with esbe mixing valves squealing and seizing up? Do they sell replacement spools or can they be cleaned. 18 zone radiant system I installed 10 years ago with 14 mixing valves all starting to act up. My supplier no longer carries danfoss and I cannot find another supplier that does or at least knows anything about them. Any tricks to cleaning them? Any help offered will be appreciated. Thanks,
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