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@kkg337
if you remove the nut at the top of the solenoid you should be able to remove the brass connection from the bottom (as at 3:49 in the video). You can check if the hole is blocked by blowing air through the top and covering each hole in turn with a finger. One will provide noticably more resistance, but you should be able to blow air through both. If you can't, that suggests still blocked. On paticularly grimed up machines, descaling can 're'-clog this small hole, and sometimes need a physical (needle?) dig around to clear, if there is any scale dislodged further up in the system, you might have to repeat this process a few times.