1: Remove the two screws holing the third brake light on. a stubby phillips works fine.
2: Pull the light down. it will just hang from the wires.
3: Mask the area in front of the LED bulbs with 1" blue painters tape.
4: Trim the tape with a box cutter or razor to just cover the area in front of...
Thank you both. It was one of the problems I was looking for a solution to today. By checking the origins, I finally reached the source of the problem. :) It's much better now. I am grateful for this information.