how do i fix the radio display for my peugeot 407?

The display on my 2004 407 has a fault. The display is only showing the top right corner. the other 3 quarters are totally blank. The display has been going funny for a few weeks i.e. lines missing and pixels missing (usually when hot). All i can see when on audio mode is the radio station. Please help. How do i remove the panels ect to get to the back as i think it may be a loose connection or something?
Thanks.