Xbox One Elite Controller (Model 1698) Motherboard Replacement

You can remove the side panels with a pry tool.

Remove the 5 Torx Security Bit (TR9) screws.

Pry the panel next to the 3.5mm port.

You can pop the connector up to remove the ribbon easily.

Ribbon Cable

Remove the 2 Torx (T6) screws.

Desolder the 4 wires on each side, these control the vibrations and the RT LT.

Pull up from the "top" side of the controller on the daughterboard.