52 17... Removing and installing/replacing left or right thigh support

Release screws (1).

Disconnect plug connections (2).

Remove thigh support (3) towards top.

Fig 1: Identifying Plug Connections, Thigh Support And Screws

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If necessary, unclip trim (1) towards top and remove.

Installation: 

Secure guide pins (2) in seat frame and clip trim (1) into place.

Fig 2: Removing Seat Frame Cover

Courtesy of BMW OF NORTH AMERICA, INC.