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I know this thread is ages old, but so glad I found it! The heat exchanger is leaking and system dropping pressure on our 7 year old Worcester Bosch. One plumber said the boiler was as good as dead and not viable to repair as replacement parts would be £600+. Phoned WB and went along with a script similar to this one and they're honouring the 10 year guarantee with just labour costs to pay. Thanks everyone again