Carefully pull the housing towards you to split the unit apart.

Loosen and remove the 3 cables (shown with the RED arrows in the picture)

Remove the screws from the power supply (4 pieces shown with the GREEN arrows) and remove the power supply.

Remove the screws holding the heat-conducting sheet (5 pieces shown with the YELLOW arrow).

solder the new 250V T1,6A fuse to the board