The rear left parking lights (2 of 3) on my 2013 ford convertible aren't workin

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I purchased 2 bulbs and cannot seem to figure out how to change them! The repair guy said the whole assembly may need to be replaced? The Manual indicates they are LED and should last the life of the car. I have full warranty coverage w/ 100 deductable. All other lights, turn signals, brake lights etc work. The left blinker was blinking very fast prior to this happening