Dickysweets

Hi all, just joined here and having grief from my main beam display light on my dash board. All other symbols light up but not the full beam. It's failed the MOT on it so need to get it fixes ASAP. Can any help or has anyone experienced the same problem? Do I need to take the instrument cluster out (and how)? Or is it simply a bulb gone. I've checked the fuses and they all seem fine. Any help much appreciated and thanks in advance.