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drop system pressure to zero and leave valve open. pump up expansion vessel to 1.0 bar and check that shraeder valve isn't leaking when you unplug air pump close valve. raise system pressure 1.0 bar only. turn system back on. locate PRV(pressure release valve) pipe. ( should be an open end...

you could check if the link is still in. But to do that breaks the case seal integrity and should only be done by a gassafe registered engineer.