how can I fix a leaking valve on my Worcester 28i combi boiler?

HInt - go to the trade section of the website, then look for discontinued boiler literature. Hang on..

http://www.worcester-bosch.co.uk/installer/literature/discontinued-boiler-literature/discontinued-gas-boiler-literature

Now go and download the Installation and servicing instructions for your boiler. That should help.

Bunslinger
May 2009