Saeco Magic Deluxe group blocked

The brewing group is blocked. Display shows "group blocked". With a trick I get the brewing group working but the brewing group does not finish the cycle. So brewing group goes back at three quarters. Then it says 'group blocked' again.

Does anyone know what this could be? And more importantly how this can be fixed?

Hello, what have you done so already everything since maintenance on the brewing unit and water intake nozzle?
In the neighboring forum Saecoforum, you can learn more under the downloads.

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Will be the transistor. TIP33C or BD245C. Sits on the heat sink of the board.
Known problem.