Lamp Model E100wsb-c How Do I Replace A Lamp On My Sony 50'' Grand Wega, Model KDS-R50XBR1?

How do I replace a lamp on my Sony 50'' Grand Wega, Model KDS-R50XBR1? - lamp model e100wsb-c

I read the manual, but it seems to show no light "door" and the manual indicates that only a little. I'm supposed to take off the entire back? I also see a small door in the lower right corner, near Reading with a small screw, but it is too small for the lamp.