The transponder isn't receiving GPS position from the TN72. We confirmed the TN72 is working and sending out data, but the TT22 transponder isn't getting position info. We suspect a bad GPS antenna so another has been ordered for overnight delivery in the hope our inspection the day after tomorrow goes forward. I'm guessing the ADSB won't be a show-stopper since it's not required where we are initially flying. We did pull the protective plastic off the Kanardia screens in anticipation of her being ready to fly!