The brake light that's behind the sub box....one of the lights bulb won't light up when I push the brake. I looked around and nothing is blown or loose, i even tried switching blubs and the bulbs are fine...i'm thinking it's the unit that the bulbs tab into.

 

sounds like dealer time to me.

 

The are two wires that are connected to the "sub box brake lights". One for the left bulb and one for the right.
If you have a spoiler, one of the connections is routed to power the spoiler brake light. As such, only one side of your sub box brake light will work.
From what I have been told, by law, you are only allowed a total of 3 brake lights, so if you have a spoiler, the "sub box brake unit" has to be disabled.