Boiler pressure constantly dropping - help!

[Unregistered]

I wonder if any of you guys could advise me please. Last night then pressures on my combi boiler dropped to zero. I refilled vut within an hour it'd dropped again. There's water dripping from the pipe outside the house. Does it sound like the pressure release valve needs replacing? How East us this to do myself? I'm female and a single parent, and although I'm fairly handy round the house I do need things explaining to me in simple terms :-D
Any help would be gratefully appreciated.

Thanks,
Jules

 

[Dotty]

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