Insert a 1.5mm flat-head screwdriver into the notch to the right of the LED assembly, and pry the black plastic frame out of the case.

Using some tweezers to pull out the clear plastic light pipe assembly.

The orange flex cable (with the LEDs) is attached to the black plastic frame with adhesive; if you accidentally pull the cable off the plastic frame, pull the plastic frame and light pipe out with tweezers and reassemble them.