Dragging this thread back out again!
The lights on our RCZ had completely failed, after some random flashing and multiple LEDs out.
So I decided to have a go at taking it apart and thought I'd update here
SO, first off, it's not just a couple of Torqs to get the thing out, take out all the clips in the tailgate trim, then there are 2 torq screws in the handle wells. Drop the panel down and the light unit is held with 2 10mm nuts (the others are on metal, these are on plastic so you can tell which two) - there are 2 utter b4st4rd spring clips under the boot lock mechanism mount, I gently prised the light while manipulating the clips with a screwdriver to get the out.
Now the fun part, that light is NOT intended to be taken apart!!! Enter the dremel, I had to cut the entire perimeter, and not too close to the edge either as the glue is quite deep, took a little while but it's not pretty!! I wound up with a slight crack at one end of the lens but it's under the spoiler so not visible, just don't try to pry too much.
Once in there the board is pretty simple, but a pig to get near, no sign of obvious dry joints etc so I think it's actually the surface mount components that have failed (rather than just the LEDs). Hence I got a stanley and just chopped all the LEDs off to leave a smooth panel and bonded on some kitchen style LED strip to it.
Soldered to the existing cable and then hot melt glued the panel in and glued the unit back together (after cleaning up the edges).
I also had to remove the reflector which is a shame, but the alignment was no where near.
I'd already decided to buy a new one from Holland (about £125) so had nothing to lose, is it perfect? no where near, does it work, yes absolutely (it's a little bit more purple than pure red, but fine)
The end result will do for now, to be fair I'm almost reluctant to buy a proper one in case that goes, I've got a roll of these strip LEDs for about a tenner, could fix about 10 if it weren't such a sod to get into!