My 07 Vogue SE came with a Rear entertainment system however it just says DVD error. I went to take the changer out to have a look. Low and behold it wasn't screwed in, so someone has been there before. Looking at the wiring it doesn't look original.

That isn't the original DVD changer, the factory fitted an Alpine unit. 2016 RRS Autobiography, Gone in 2018 56 plate Vogue SE TDV8 - my first Land Rover since Disco 2. Other cars 2012 Boxster S, 2007 FL2, 1996 MX5 Gleneagles, kids Fiat 500 and Corsa. Recent now gone 2003 Subaru WRX Wagon PPP, Mk3.5 MX5, VW Tiguan, 997 Porsche Carerra 4S, Porsche Boxster S (old) and wife's 2007 Saab Wagon. Recently had Subaru Impreza STI PPP, various MX5s and RX8. RR is first grown up car for a while.

I found some info but its on another site.
This guy retrofitted a RSE system to factory spec on a Disco and explained the process.
If you check this thread you should find the description from the member called AJAY is very accurate and may help.
http://www.disco3.co.uk/forum/topic47680.html

Best of luck.