I had read somewhere on this board that if the unit was resoldered that the core was shot so I figured I had nothing to loose. When I took it out of the dash the board was very hot in a couple of spots. You can even see the heat damage done over the years.
To answer the question yes all functions came back after I was done. I had to do it twice because the first time I had made a connection between two traces that I didn't see and it would not shut off.
I was thinking bad monovalve but noticed that the vents would have plenty of hot air but the fan would not blow. Defrost worked until this year as well. When it went a couple of weeks ago I figured it had to be the PBU. Was going to just pull it and look for a rebuild till I noticed the rebuild sticker on the bottom. Lucky I guess that the things were made in the early 80's. Single layer boards, big fat traces, resistors that you can not only see, but you can see the color bands on them. You can get a gun tip on them no problem. If your unit is bad it's worth a shot before shelling out 2 bills on a rebuild.
Now I guess I'm going to try the cruise control module