96 Discovery, lower, 'Tailgate' light assembly configuration

I have no brake light on my rear passenger side. In fact, when I depress the brake pedal, I get NO LIGHTS on that side at all. I assume its a bad connection or electrical issue, but anyone have any idea where to look. Also, what's the easiest way to access and change the lights in the rear of the vehicle. I have the low rear light assembly configuration, not the kind that go up the side of the vehicle. Thanks.

Shamus

 

Does anyone know how or where to access the rear brake lights. If I can get in there, I can probably figure out the problem.

Thanks
Shamus