Things You'll Need
Instructions
Unscrew the four Philips screws on the back of your controller.
Pull the controller apart at the seams. Make sure not to put more pressure on the circuit board than you have to.
Push the frame holding the L1 and L2 buttons in up and away from the controller.
Take out the broken L1 and L2 button covers from the frame. They will slide backwards then lift out.
Determine if the switches are broken. Underneath of the button covers you removed, there are two rubber pads with rounded mounds on top of each. Press them. If they click, the switches are fine. If they don't click or are in a down position, then manually pull them to the upright position. Once the switches are up, press them down again to see if they click. If they stay down or do not click, your controller cannot be repaired.
Place the replacement button covers into the shoulder button frame.