Just a quick update
After first calling Louet Holland and next Louet Canada, all is now working again. Jan in Canada guided me "hands on" through the inside of the interface box. Scary.
When a shaft stops working during weaving, it can be the connection to the solenoid.
After taking this connection apart and fitting it back on again the shaft is lifting again.
So, back to weaving. The sun is shining. What more do I want.
Thanks for replying to my cry for help!