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descale Rayburn boiler?

I have a Rayburn 380L LPG boiler.makes knocking noises when turned on and switches off before circulation takes place.Plumbers says it has blocked heat exchanger.It is 9 years old.Estimate to flush is £350 which seems a lot. Any ideas if I can tackle it myself? I have lots of DIY experience and have done quite a lot of plumbing.
J .Barratt, February 2009
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