Opening it up this is what you will see:

The center control is screwed and soldered in place but once you remove it this is what you will see:

Technically you do not have to remove the center control unless you want to switch the color of the little arrows on the knob. I did not but I likes the chrome knob style of the later models.
These are the guys you'll be removing:

There are 47 of them so plan and spending some time.
Once led removed one still installed:

First couple swapped out:

More swapped out:

Done:

You'll notice the "Zoom Out" button is not lit. The later cars have two fewer leds so I'll have to hunt down some that match. I left the indicator leds (on/off) as amber for some contrast. Also left the arrows on the control knob as amber.
Slightly different circuit board on the later cars, unfortunate as a swap would have gone a LOT faster, LOL.
Other mods I've done: new-headlight-idea-grill-mod-and-ink-pens-t578064.html as well as others scattered on the forum. I need to put together a complete list of mods.