Just for some closure, I thought I'd post my before and afters for this little project, along with some thanks for those that helped/inspired me whether they knew it or not.
A good thread that I used - thanks JJ:
http://forums.pelicanparts.com/porsche-911-technical-forum/589980-cleaning-flapper-boxes.html
Car is an '87 with the autoheat/thermocouple (temp' sensor) - I found my late-dads' rivet tool and some spare rivets from the 1960's(?!) that were perfect for re-attaching the sensor. I started in the summer 'cause I was in there - a little early for heat, but I am so slow, it's turning out to be just in time :-).
I still should lube the cable - maybe I will get to it when I service the servos from the inside. I removed, cleaned, powder coated in JD Green, and re-used all of the original hardware. (edit:except cotter pins and tubing)
My before (drivers side only)
After
