The power winter buttons were probably the toughest of all of the buttons to replce with Led's. As far as getting to it all you need is a phillips to take apart all of the plastic interior trim peices then once you get the power winter buttons out use a very very small regular head screw driver to carefully pry the housing apart. Once it is all apart there are two very small bulbs in there. The easiest thing to do is to unwrap the wire leads from around their rubber bases after sliding the bulbs and the bulbs out from there mounts. If you replace with Led's you will need to put the resistors for the LED's in line outside of the housing all together. It is easy to re wrap the wire leads for the new bulbs around the old rubber bases and just slide into place.
BE VERY VERY CAREFUL to not loose the two small ball bearings and springs that are in there. Careully make note of exactly how it all goes together in there before you end up like me with everything apart and relying on trial and error to see which option gets the power button to push and stay and gets the winter buttom to just press and immediately come back to the original position. Basically you have to completely pull the housing apart to get to these bulbs and until you see the bulbs in this housing you are not there yet. The bulbs wire leads will be pushed through and wrapped around black rubber "blocks" that have I think two very small holes in them. It is not that complicated but be careful not to loose any parts as the sprinngs will probably unseat and parts could go everywhere. As I remember the bulbs in this housing are even smaller than the other housing. But somehow I managed to fit two LEDs in there so I am sure you will be able to figure something out. Bad thing is I think I remember saving all these pictures of this on my roommate's computer and now I have a new roommate and new computer. I'll ask him if he can e-mail them to me maybe. Hope that helps, but yes this housing is constructed completely different than the others.