I think I am 4 years too late in replying this, but I think someone may find this info useful. The previous reply to this question did not answer the question. I just fixed mine yesterday and was confused by reading the response before I finally figured it out. This is what you need to do.
The rubber seal is not removable. Ther are two white plastic clips-like push pins next to the rubber seal. These 2 plastic push pins hold the light assembly in place. Before you use a pair of plier to remove and un-hinge the clips, you have to first remove 2 screws on the outside of the car. Next to the license plate, there are 2 black plastic round covers, about the size of a dime. Remove the round cover and you will see 2 screws. Remove both screws and then un-hinge the plastic clips next to the rubber seal on the inside of the quarter panel. The light assembly should come free.
Turn the light knob counter clock wise, and replace the bulb. Reverse the process to put everything together.
Hope you'll find this useful.
Thanks for the post. Is everything that you described external or do you have to remove the three bolts inside the trunk behind the liner (after taking off plastic trunk guard)? Thanks.
Steve