Your boiler is still under warranty, You can not repair this your self get Vokera out, I know what will be leaking, but it is not something you can do, get it done as soon as you can or the gas valve will fail too and you wont have heating or hot water, call Vokera and ask for them to service your boiler , and that will restore your warranty, and get it serviced every year to keep the warranty up to date
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