FWIW

If you get worn out, and want to quit guessing, I highly recommend my indy in Bellevue, WA

Star Auto Service
13622 Northeast 20th Street, Bellevue, WA 98005
(425) 641-3389

He was trained in Germany on these cars, and now the W126 is what he works on most (there are lots of them up there).

Anyway, you could drive up there, see a Mariner's baseball game, and get it fixed right. No guessing on his part, he knows all the diagnostic methods and was more than fair on labor.

Best of luck