I pulled out all three boxes. Took apart what i could and cleaned them, and replaced the heater core. There really isn't anything that "needs" done. You might want to wrap some wires or metal in foam to limit rattles. I also refoamed some of the areas on the black boxes that were worn.
The sensor at the top right window vent is fun to disconnect. You don't have to take the glove box "frame" out. I did that on my one dash. *ooops*
