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Thanks guys for the replies. I know how difficult it is to remove as I installed this boiler some nine years ago and had it commisioned by a corgi registered installer. Yes the EV is leaking water and the presure is all over the place. Looks like I may have to remove the boiler after all...

Hi all, I will be changing the leaking expansion vessel on my Optima 701 just wondering if this could be done without removing the boiler from the wall !!! Well thought Id ask. Also can anyone advise the presure I need to put into it, cant find anythink in the installation manual. Many thanks Nick