What was found
LT ENGINE START WAS NORMAL, BUT AT IDLE, AMBER CAS MSG (FADEC FAULT L A-B) ILLUMINATED, AND THE ENGINE SHUTDOWN. FADEC RESET HAD NOT AFFECT ON FADEC OPERATION. DOWNLOADED FAULTS NO FAULTS DETECTED. RAN AIRCRAFT OPS CHECK GOOD. WORK DONE IAW CESSNA 750 MM CH 71-00-04.