Hi again Fred,
As you already know by my history with an 'S'
been there done it. Replaced mine last year as it also was eaten my microscopic mites which eat aluminum, especially Behr evaporators which weren't plastic dipped on the ends and chemically treated for prevention. Many 124&140 cars have this problem thru part of 95 and especially in the southeast. Don't try this yourself as you'll probably end with a cracked windshield. Pay the man and be done with it.
Flat rate is around 21.8 hrs. @ ?? plus parts.

Good Luck

Tobias MB
300SE(sold), 300CE, C280Sport, 190/5.0