I have replaced the bulb, still no brake light. The tail lights work, the turn signal works. The lens was recently damaged from a small collision. The drivers side stop light works as works as the center one. I'm thinking the harness needs to be replaced.

 

yeah collision might have frayed or maybe clipped a harness or damaged the plug, if its not the bulb then its something on the cars side... obviously since youve already narrowed it down to that side....... yeah, check the leads and wires make sure none are cut, if it turns out to not be those, its the plug/socket thingy