Other than the fact that the third brakelight is working I would say that perhaps it was the bulb out sensor relay. It is a round red plastic cased relay on the driver's side just behind the knee bolster; it is the only round red item there so it is pretty easy to find.

If you could find someone with a known good one you could swap it out for yours and see if it fixed your problem.

Electrical issues are not my strong area, there are several people who frequent the board who would be more helpful than I will be beyond this point.

You might do well to repost your problem and include what addtional information you have at this time. Good luck.

Randy