Baxi Combi pressure problem

13 Oct 2006
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United Kingdom
Bled my rads, dropped pressure to 0, so increased it (to 2!!!). Since that there was a drip under pump? Service engineer came out recharged expansion vessel, replaced o ring and drip stopped. However pressure drops every night from 0.6 to 0 (but still have hot water and rads fine). Any idea, boilerman says I have a leak, expansion vessel is holding its charge but is this a coincidence? He suggested locating leak or putting in leak sealant. Help?
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WHat boiler?

Checked the pressure relief pipe through the wall?
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