Rear liscese plate bulbs on 05 cadillac srx

First you have to take out the one and only screw in the rear hatch door - it's where the hand pull down is you use to close the hatch.
Then you have to pop all the plastic clips all the way around the plastic door panel, trying not to pull them out from the frame . If you do pull out the white plastic plugs from the frame you better make certain you take them off the plastic housing and insert them back into their frame holes - or you will never get the housing back on.

Once you have the housing loose disconnect the inside tail gate light wire to remove the whole thing. Then you have to remove 7 to 8 nuts from the back of entire License plate, back up bulb housing using a deep socket to get in there. Work it loose from the rear of the car and it will come out just enough to work on the lights.
This is tricky since the screw mounts don't give you much room to work with.

Once you have the license plate and back up bulb frame loose you will see the two housings for the license plate bulbs on top.

Slide out the license plate bulb lens and twist the bulb connection to remove the bulbs.
Replace both of them - you don't want to do this again in a month when the other one blows.

OPTIONAL:
Once you take out the bulbs you might see that the housing is melted where the bulb wanted to burn through. Drill two small holes one is each end of the housing before I put everything back together to release some of the heat.

Reverse the whole process to put everything back together. It's not easy.
Make sure you insert the cables through the opening for the hatch handle or it will kink and not work properly.

The bulbs come in a two pack of cost $4.95 .