Gasket in the inlet valve

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Open the side panel and remove the brewing unit.

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Remove the drip tray underneath the brewing unit.

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Unscrew the four Torx T10 screws that hold in place the cover of the inlet valve.

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You can replace the seals, it's even better if you remove the nozzle completely.

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Here you see the removed socket. Note the double O-rings. They may get stuck in the opening.