Here's my original description of the problem:
What controls Full Throttle/Kickdown on M104?
What does "Warranty time is 1.8 hrs w/o any adjustments" mean? The MB tech has a very good rep in this area. I saw, or rather felt, what was done though. They backed off the bowden cable to the point that it was holding gear to about 3.2k rpm in 3rd at part throttle. I had told them I had already done all that and that the problem was not part throttle. Thing was, they left it in that position and I had to screw it back in to make the part throttle shifts normal. At least they figured that external adjustments were not going to fix it.