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Here’s a video of a return manifold (right hand manifold) replacement for a Worcester Bosch Greenstar 30si.
Replaced the manifold including the PRV and flow adaptor.
There was an additional problem with the pump is it was blowing the PCB fuse due to a short circuit. Diagnosed and replaced the pump. It was very dark and wet in the cellar so I couldn't make a detailed video however if you have any questions, please drop me a line and I will get back to you. Thanks for watching and don't forget to like and subscribe.