I bought a window regulator from them for my W210. They were efficient. I was more interested in fast service at the time and understood the replacement part was not made in Germany.

Contact them and explain your are a MB Tech and what you are seeing and see what happens. Costs you nothing but free time.

__________________
Terry Allison
N. Calif. & Boca Chica, Panama

09' E320 Bluetec 77k (USA)
09' Hyundai Santa Fe Diesel 48k (S.A.)