The 12V power socket slides down to reveal a single screw that holds the light cluster in place. Press the top of the 12V socket panel and slide it downwards.
Using a 11mm socket set simply unscrew the central white nut which holds the light cluster in place. Once the light cluster is unscrewed unclip the power cable and replace the light unit. Total time about 5 minutes.
Sorry for a slightly random blog post. Please let me know if it was helpful to you!