How does 23-026 come off?

The 23-026 is usually just held on with those hooks you see on the side of the housing. To remove it, you need to take the door out of the frame and put it on a stable surface. Then you need to use a pair of needle nose pliers to kind of work it out. It's in there tight, so it will be a little frustrating at first, but if you have a firm grip and a steady hand then you should be able to wriggle it out.