To remove the buttons section, first remove the radio using the removal clips. If you don't have these to hand, use alternatives.

If you have an aftermarket radio, you can get around this by pulling the frame off around the buttons. This is a bit fiddly which is why ideally, it is easier to remove the radio first as you can get to the retaining clips.

The button frame is held in place at the sides by clips which need to be pushed in order to release.

You can now unplug all the connectors ensuring you note which ones are connected to which button.

Once disconnected, the buttons simply push out of the frame.

To access the PCB, turn the button over and dismantle it by levering it where shown.

Take the PCB and begin your LED changes.