This example is from a Corsa D radio, however all models have the same process to disassemble and have the same LED type.
Remove the tom Torx screw at the top of the photo on either side.
Remove the lid and there is a black tab in the middle of the radio to unhook over the case.
Whilst unhooking the tab, lever the front off one side then the next.
The front is now removed with it′s frame. Remove all the Torx screws.
The round point LEDs can now be seen to be removed.