Just in case anyone else needs this info, there was a Technical Service Bulletin (TSB) for the 1997 E420 (W210) 5 speed auto transmissions.
TSB No.: 980501980501
Summary Description: Replacement of automatic transmission 722.6 with transmission serial numbers up to and including 880338 TP 951700. *YC

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Thanks,
Dave

1998 BMW 540i Sport
1995 E320
1992 400E
1989 BMW M3
1979 Triumph TR7 (1st car)
1986 BMW 735i (Sold)
1980 BMW 320i (Sold)