Thank you much. As far as I understand the boat has a separate speed controller. I think it also has circuit board (?) for different functions (lights, sound). I’am a total layman in these matters, but I suppose a speed controller should be quite easily replaced? The circuit board, on the other hand may be a different story. The problem is I have no knowledge to pinpoint the defective component(s). The boat was inspected by a salespearson in a RC-shop and his conclusion was a defective receiver.