BG Network Wind

Oct 2, 2010
127
Beneteau 36 cc Humlebæk
Our BG Network Wind Display Unit is "frozen"

The LCD displays "18.8appvstrue", the analogue pointer does not move and nothing happens when pressing any of the 5 keys on the Unit with voltage on. When voltage is turned off LCD is empty and the backlight is off.

I suspect the culprit is a bad connection in one or more of the 5 keys. I would like to open the display unit and clean the connections, Does anybody know how to open the display ?