Trailer clearance lights out

Since all 5 top across the back clearance light and the red lights at the rear right and left side are ALL out that seems like a fuse.
I don't see a listing in the fuse panel (cab-2018 Freightliner) for ANY trailer wiring except ABS.
Am I looking in the wrong place?

 

I'll see if I can find it. Thank you

 

Ugh. Not like a flatbed trailer. Can't follow anything. Everything is up inside the trailer structure or maybe in the bulkhead wiring box. Guess I'm asking boss man to take it from here LOL

 

I'm guessing it's this. I had to back up like I was a proficient city reefer driver...except I'm only an ok flatbedder and I pulled the pigtail so hard the plastic deformed! I replaced the cord but might have stressed the pins. (Horrible inner city Atlanta warehouse you have to jackknife and keep pushing to square up to the dock. I don't even know why that's a thing FFS ...get a straight truck...)
Anyway. Thanks for the input. I'm handing this off the guy who owns this problem LOL it's above my pay grade.