If both brake lights won't work, I'd say check the brake light fuse. My 07 Magnum is fuse 15 in the rear box, yours may be the same. Since it's just one side that doesn't work, check the wiring. If they are connected properly and the wiring is not damaged, it's prolly a faulty brake light. If that's the case, you may need to replace em. I have the same tail lights and I don't think there's any way to service the bulbs. Once they're out, they're out. HID problems are beyond common, buy only cuz HIDs are a total PITA. I don't think the two problems are related.