Logan5nx

My driver side "interior" tail light went out, I attempted to replace it with a working blub but it didn't work. A few weeks later my third brake light is now stuck on when my parking/headlights are on.

During the day w/o the lights on, the third brake light works as normal. It's only when my headlights are on that it's stuck always on.

I've tried fooling with the rear lights, but nothing seems to work. I'm not sure exactly where to locate the switch at the front of the car to check that.

Any ideas as to what else I could check? Thanks.