There isn't any such bulletin! Many mods were done to this trans in it's lifetime but NOTHING as far as reinforcement of that band. The lining & application piston were modified however.

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MERCEDES Benz Master Guild Technician (6 TIMES)
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190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)
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