Received the replacement GSU 25 ADAHRS unit from Garmin. John and I pushed the plane to a nearby dirt field to avoid ferrous metal for calibration of the magnetometer. Tracey jumped in to give us the incremental commands to turn the plane as it calibrated. It worked! I now see the sky and ground, rather than just plain black on the PFD screen. There is even a little bit of Pike's Peak and the runway on synthetic vision. It just came to life!