Using a small Phillips screwdriver, remove the 2 screws that hold the IR sensor PCB to the robot.

Placing your fingers on the side to avoid damaging the PCB, lift away from the robot.

Once the PCB has been removed, lift out the plastic covers for the IR sensor from the robot.

Repeat for the other 2 IR sensors. Note, the sensor at the front is only accessible once the main PCB has been removed, hence why it was avoided until now.