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Vailant 828e combi boiler pressure drop?

The above combi boiler is loosing water pressure, very slowly. I have checked radiators (no leaks) & expansion vessel is pressurised & working o.k.
This all came about after draining the system to install new thermo rad valves and re-pressurising the system. can any one advise?
Mick Lloyd, November 2013
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