Went out to a leak on a Cdi. Armed myself with an o ring pack whipped the plate out and found the diverter rusted and a small amount broken off. So new diverter valve needed grab another and out comes the old spend a good 5 minutes cleaning up the cold inlet so it's sparkling clean put it all back in with a bit of grease turn the mains on and wait, yep there it is the little drip that happens every bl00dy time. Can't they put a slightly larger o ring in as obviously the one they supply is pants! So strip it back out again clean it up even more put it all back in again and guess what still leaking!!!!!!! How on earth were they ever the best boiler? Must of been a lot of money swapping hands.