I've been calling some local airplane mechanics to schedule my transponder inspection required by 91.413. One them asked me "How many transponders do you have?" I have one transponder, a Garmin GTX32. "Do you also have an ADS-B transponder?" I have an Echo UAT transceiver that gives me ADS-B in and out. So, he says that means I have 2 transponders and he needs to inspect both of them. According to him.
He is the most expensive and the only one that asked about my ADS-B. My ADS-B passed the FAA performance report. Are we required to have our ADS-B systems checked every two years like this guy says?