To take the actual assemblies out is not that hard. Find the screws on the back side and ttop and take them out. Once the screws are out you can pull the assembly forward and it will come out. Remember to disconnect the sockets/bulbs from the assembly too.
Once the assembly is out you'll want to "cook" them in the oven to the temperature indicated on the tech article. I let it sit in the oven for about 15 minutes and then took a big flat blade screwdriver and started prying around the edges to loosen the glue and joint. After you make one pass of prying put it back in the oven and let it cook some more. Then pull it out, pry, and put it back in the oven. Do this a few times and you'll see it coming apart. Eventially the clear piece will separate from the back and it will come apart.
When you put it back together put both pieces in the oven to soften the glue. Then scrape away the old glue or reshapen it to make the two pieces fit easier. Get some silicone glue/sealant to help glue the pieces back together. Take your time and be patient.
Hope that helps..
bk
94tt - Chicago