Greetings. I just replace the rear bumper on a 2008 Q5. The only plugs that were unplugged, were the plug for the park assist and the harness for the rear bumper. With the bumper back in place during the light check, the brake lights in the rear hatch don't work. The brake lights in the bumper work, both sides. the third brake light in the hatch works. The tag lights work.this What am I missing....I rechecked all the plugs that I had unplugged to make sure they where all plugged in. I did nothing to the hatch..Help!!