air damper -- how to get to it

1993 Camry, 4 cyl, auto

The air location is stuck at combination of floor/defrost. The switch is fine and I can hear a motor run when I turn the switch to try to get air out of dash vents. I believe that the air damper is in a bind. How do I get to the air damper? It appears that most of the lower dash and console must be removed to get to it. Has anyone here done this before or have any drawings or instructions?

My Haynes repair manual does not even mention the air control motor or damper -- much less show a picture of where it is.