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If you try pulling them out of the door trim then you need to be very carful as the 10+ year old plastic covers have a tendency to come off leaving the rest of the light in the trim.
Now that I remember correctly, there are two tabs, one on top and one on the bottom. I use a small screwdriver and push it down behind the tabs while pulling out.
Maybe the WH door lights are different to your, tabs are top and bottom.I think the tabs are on the side, even doing it properly they still have a tendency to break when they have aged.