Hi,
The band adjustment is at the front of the transmission on the passenger side. You should see a threaded stud with a 10 mm head on it and a larger locknut around the outside. If that's the problem, you'll see that it has backed out of the case. If not, it's likely to be the lip seal for the servo
(on the driver's side of the trans opposite the adjuster)is leaking. Either one can cause the problem you're having.
Regards,
Randy D.

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W.R.Durrance
ASE Master Tech
Mercedes Tech 21 Years
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W.R.Durrance Engineering