Yesterday I was sandwiched between Luke AFB on one side of me and Sky Harbor (class bravo) on the other side and above. I was transitioning Glendale (class D) below me. Just as I was thinking how well I was doing I received the attached messages on my GNS530W. It was a little disconcerting for a semi-rookie like me. I am hoping someone can give me some suggestions on diagnosing what is causing these messages. I recently had the following work done. 1. GNS530 sent in to Garmin for a WAAS upgrade. 2. New PS Engineering PMA8000BT audio installed. 3. New Garmin GTX345 installed. My local avionics guy thinks it might be the coax that runs to the antennas. Garmin wants me to have my mechanic call them. This problem has existed since the above work was done.
Any help or suggestions would be appreciated.