94 concours stp light is dimmer than the other lights?
 

So on my 94 deville concours my top light in the rear left cluster is dim when compared to the other lights. It appears that the light is still working because it isnt completely out, but whenever i run it at night its a noticable difference in the luminocity of the top left stop light/ blinker and all of the other lights.

Anyone have any idea as to why just this one light would be extra dim but all of the other lights are just fine?

ive already tried replacing the bulbs in the top lights, new bulb in top left, then even tried using the top right bulb with no effect. i do want to say that when i switched them that the bulb that was dim on the left was at full brightness on the right side...

any help would be great cuz i dont feel comfotable driving this at night so i dont get pulled over or messed with by the police... thanks guys

Come on now guys, i know someone out there can help me out with this...