WHat am I missing?

Remove two screws at bottom of seat back.
Pry out rubber plug and remove screw holding lumbar support lever on seat side.
Wiggle / pry two headrest posts from black plastic holder at their bottom end ( This carriage raises and lowers headrest).
Disconnect wire to headrest at yellow connector (neck-pro power).
Pull up on headrest.

It comes to a solid stop once the bottom of the posts enter the guide.
There is no release button, that I can see/feel, as there was on the 210 front seat.

WHat is the last step in releasing the headrest?