Okay, you're on the right track. Under the tail light assembly, there are 5 fitting claws that hold it in place on the outside, you can use a flat head screw driver to pry upwards from underneath the bottom egde, disconnect the power from the tail light assembly, and remove the two screws from the back of the tail light assebly, the bulb twists out. That should do it, if not, let me know and I will try to find what I missed.
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