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it was the expansion vessel and we had it fixed a few months ago

it is seeping out water (not much) where the pink part (387) joins the green part. The operating head won't come out, although it should just lift out once the spring clip is removed. There is alot of brown gunk around where the parts join and half of the clip has rusted away. Does this mean...

started to ease it off and water started seeping out ! now seems to be stuck and unable to lift it off. What is in the diverter valve where the operating head joins to.?

do you need to drain the primary circuit before changing the diverter valve operating head

it's more like a clanging/clunking/rattling sound.

After the hot water tap is turned off there is a noise from the boiler that lasts anything from a few seconds to several minutes. This only happens when the CH is also on. The noise sounds like it is a valve trying to open/close. The DHW and CH pressure differential valve diaphragms have both...