Here's the process as described in the Bentley manual: (red parentheses are mine)
"Carefully pry out license place light (lens from the top) with a suitable tool (screwdriver blade) until retaining tab releases.
* Remove license plate light and disconnect harness connector.
* To remove bulb. turn bulb holder counterclockwise and pull out from housing.
CAUTION-
Do not touch the glass portion of the bulb with bare hands. The moisture and/or grease from fingers that evaporates on the bulb during operation, can cause the glass to cloud over."
Open your trunk the two inner bulbs are for your license plate twist and should pop right out
push up and turn on the housing
You need to remove the liner on the trunk lid. That will give you access to the license plate lights housing. Remove the sockets by twisting 1/4 turn and replace bulbs. Size for bulbs are 2825
The clear covers for the license plate light bulbs have small arrows pointing in one direction. Simply push the cover to the direction of the arrows and the covers will slide off allowing for the old light bulbs to be replaced.
OPEN THE TRUNK LID. JUST INSIDE THE LID BEHIND THE LICENSE BULB CASE ARE 2 PHILIP HEAD SCREWS THAT REMOVE THE BACKING PLATE. ONCE YOU REMOVE IT YOU CAN REPLACE BOTH LITTLE BULBS. THEN PUT THE PLATE AND SCREWS BACK IN YOUR READY TO GO.....
If you can not remove fasteners on outside, you may need to cut a section out of the inside of trunk to get your hand by the bulbs.
Remove the screws that hold the covers in place. Replace bulbs!
There are two (2) lights directly above the license plate. Each light has two (2) screws. Remove these screws and the covers. Lights pop out with little effort. Replace bad bulbs with size 194 lights. These are approx $2 at walmart or an auto parts store. Once bulbs are replaced, reattach covers with the screws and you should be good to go.
On top of the license plate is a clear plastic lens with 2 screws in it. Take it off. Then a bulb slides into the holder, then replace the lens. There are 2 bulbs. One on each side.
in the rear facia, under the trunk lid there is 9 bolts holding the facia on. You must remove the nuts and pull the facia out and right above the license is the two bulbs 194. replace the bulbs and put the facia back on and you are on your way.
Check bulbs
Pry down the metal clip on the top with small screwdriver, then pull screwdriver forward. Assembly will come out easily from there. Small bulb to replace.