Citroen Xsara Picasso - Digital Dash Bulb Change

Citroen Xsara Picasso - digital dash bulb change on a fading dash. I changed 6 bulbs in all to get the digital display bright again. Two Torx T-15 screws have to be removed to get the display out, my friend had Torx T-20`s in his so there may be a difference in older cars.