It seems the gears get stuck in the up and down position. The inboard rear gear looks kind of bad.
I looked at the MB repair CD and it appears the parts are available seperately.

Are the seat gears/motors common with 400E? Sportline?
Has anyone out there done a rebuild?
I heard they are pretty expensive to replace and don't want to throw away $$ at the dealer.

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Bryan Harter
1992 500E Smoke Silver
2002 CLK55 AMG Cab Silver/Black
2001 Harley Fatboy - Pearl White
2004 F150 FX4 Silver/Grey
1969 GTO Liberty Blue
1956 F100 Black