Has anyone had the pleasure of working on the blend air door. My question is how do you get to it? Do you take the bottom panel off or the top panel? I started with the bottom one with glove box and still looking for more screws#*###

 

I know member Ralph P (RIP) did something with the heater and air control box. He had to remove most of the dash if I remember correctly. He will have posted something about it.
You'll have to browse though his posts.