Rear Defost on Slider Window

[bojanglespa]

I have a 2017 Sierra 1500 with factory rear slider with defrost. Last winter it quit working. There Is power to the braided wire soldered to window on D. side and across all of the grids on that d. Side section. There is good ground from the soldered wire from p. Side to the d. Side soldered wire. I have no power to the p. Side or middle section and for the life of me can not find where power goes from the d. Side to the other sections (where do I test). The tabbed connections appear just to connect current between the center and p.side but where does power get to these sides. Having difficulty finding any info on where to test next to see why it is not working. Fuses good and relay has been swapped with GM Recall being done shortly before window quit working.