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First check the fluid level. You may want to get someone familiar with MB transmissions in particular to check it and advise on if the fluid seems dirty or "burned". Usually if you are low it's because it leaked out, and your driveway or garage floor would have "informed" you by now if that were the case. But I'd still start with a level check.
If that seems OK, rather than just assume you need a transmission I'd have the pan removed and check the inside of the pan for metal chips or shavings. If that seems OK I'd assume like Steve, that there is probably a blown seal ring inside the transmission, or maybe a problem with a control valve.
Gilly
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