This next step will require some force as the cables are securely connected to the motherboard at this time.

Remove the two cables that connect the bumper and sensors from the motherboard.

As you can see in the photo, the cable and the location of where it goes on the motherboard are marked with their respective shapes.

Fully disengage the bumper, along with the skinny IR sensor track from the main part of the device.

The sensor track is hidden underneath the bumper, but it connected with several wires.