Just spent a hot 45 minutes replacing the regulator with the KAE 3.701.420 regulator from AllEuropean.com. No wires to solder or cut. Most difficult part was the contortions needed to get between the seat and under the glove box.
Blows even better than before.
Tony, for the original post and the subsequent ones with additional info - thank you muchly! Saved $850+.