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So I fixed this eventually. New gasket didn't make a difference so I tried descaling again (only descaled a couple months ago but figured it was worth a try). Backflushed with descaler solution then cafiza and it works fine again. I figure there was a flake of scale that found its way into the solenoid or something but I'm not sure. It works as it should again without having to dismantle it further so I'm happy.
Colonel_of_Truth
Have you tried going as fine as poss?
tbh sounds like the gasket/seal but could be worth a shot