Megaflow expansion vessel

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Hello everyone,
Bit of advice would be appreciated.
My Expansion vessel has recently been looked at by B Gas, the Engineer re inflated to 0.7bar via the Schrader valve and the water pressure was set at 1.2 bar.
This is because the water pressure kept on falling on the pressure gauge and I was continually having to re pressurise.
My question is what is an acceptable fall in pressure and over what time scale?
I am on a years contract with B Gas which is due to finish in the next week, I don't want to call them out again if it is not necessary.
The pressure has fallen from 1.2 bar to 0.7 bar in around 7 weeks.
Thanks in advance.
 
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Joined
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107
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Location
Avon
Country
United Kingdom
Thanks for the reply.
Could there be a hole in the rubber diaphragm, as there is no obvious leak from any of the pipework or radiators.
 
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