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Hi hope someone can help, went to a job today it's a sabre 28 Combi, was told there was a leak and she didn't know how to top up system, heating hasn't been used for months, anyway top up system/bleed couldn't see leak, turned system and stat on boiler up to max after, gauge rises to to 3.5 bar and continues to rise PRV starts to leak, that's the leak (punter confirms this is were leak was coming from). Any ideas what it could be expansion vessel? Don't really do breakdowns helping out a friend I mostly do installs need some advise, was going to call sabre (vokera) but were closed. Cheers