It has been a while since anyone has been on this thread, but my problem is the opera lights too, my understanding is to just pulled the assembly off the sail panel, I guess it is retained by couple of barrel clips that prongs extend into, I guess I will post some pictures for reference as I have found none, I have one that does no longer operate. The inverter is I guess integrated into the lamp assembly as every one has said it is a 12 volt connection to the lamp, I also have the 84 factory manual, not much in there about this. They must use a small transformer and a reed switch to generate the voltage for the electroluminescent film to operate, that would be interesting to take apart.
July 26-22
Okay got the thing off, it has 2 tabs along the top and bottom sides of the assembly opposite of each other , the top is to the left and the bottom to the right, they catch the chrome bezel and hold it in, not much to it, I can see these things popping off on their own and they look really easy to pull for someone knowing what they are going for. The glue hold the clear cover on mine came loose as it was being removed, but the whole should come out as a sealed assembly, and the unplug it from the back... the internals look to be chrome plastic "R" glued to the clear cover, a diffuser behind the clear, a shadow screen behind the diffuser, then the ectroluminesce film with 2 soldered connection to the internal electronics. Back of the film says
"GRIMES PN/94-1923-3W
5934095"
The vendor for the film looks to be a manufactuer of aircraft lighting, as they do electroluminesce instrument backlighting. Have not removed the electonics yet but am going too...the part no. by GM for this piece is 5934093