Quaternary pump pressure reading wrong

Quaternary pump showed a wrong, non-responsive pressure reading even if no flow, how to fix it? It was used about 1.5 years ago without this problem.  Thanks.

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  • THANKS ISHITIYAK!  Good to learn about this damper part.  Also of note, the pumps still work and the flow rate can be controlled --- just the pressure reading stays wrong.  Perhaps it is tolerated somewhat and we can use it temporarily before a thorough fix... Thanks again for your suggestions and prompt replies!  

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