Well well well. Seems like I need a new tail light assembly. The LED srtip has failed and it is built into the actual lens. So a whole new one. The cost? $399. Lucky me cause the other model is $799. What a poor design. You cannot replace the LES strip.
The truck is a F150 Lariat with all the bells and whistles including led's that go out a 1000 miles after the warranty.