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Hello all, Thank you for taking the time to read my post. Background: Micron Glow worm 40FF boiler. Modern 4 bed, 2 floor house, 11 radiators. Leaking pressure relief valve, failed expansion tank behind boiler. Work undertaken so far: I have fitted a new expansion tank, specified by online plumbing merchant (18L) in the airing cupboard with a new 3 bar pressure relief valve. I emptied the system and filled again including inhibitor, I set the system up at 1 bar cold pressure, bled all radiators and topped up to 1 bar. All radiators are as hot as each other and only a tiny about of air comes out of the radiators when bleeding if at all. Issue: The system has been running for 2 weeks now and I still have a pressure drop from 1 bar to 0.4-0.5 bar after each use. I hear noises in the pipes, like air is moving around. The pressure I don't believe is increasing above 3 bar. I have two gauges one on the boiler in the kitchen reading 1 bar cold, and one in the airing cupboard on expansion tank reading 2-2.5 bar cold. Can someone please give me an indication of what is going on? Many thanks, Kieran