Tail light has got me spinning.

[Phillypopin]

Driving to work the other day and my tail light/brake/signal light coughs out on my 2016 Sierra all terrain (has upgraded tail lights).... figure should be a quick fix....... nope turns out it’s a unicorn tail light that you have to replace whole damn thing so I figure I’ll check the fuse....... in the owners manual I can’t seem to find a fuse for the taillight..... any suggestions would be appreciated just to save the hassle of explaining to the police that it’s not as easy as changing a bulb it’s a 500 dollar unit at minimum....