Insert the point of a spudger under the left side of the vibration motor (near the small notch) and pry it up.

If the motor isn't budging, use a pipette or syringe to apply a drop of isopropyl alcohol (>90%) under the motor to soften the adhesive.

Remove the vibration motor.

During reassembly, use a small piece of double-sided tape to secure the vibration motor to the frame.