Pry up the motherboard assembly by tilting the Jimmy downwards.

The headphone jack is clamped into an opening in the rear cover of the controller. Make sure the headphone jack is not stuck in its recess during the prying procedure.

During reassembly make sure the headphone jack snaps back into its recess.

Do not try to remove the motherboard assembly all the way yet. It is still connected to the rear cover by the battery cable.