What was found
IN CRUISE NR 1, 2, AND 3 DU'S WENT BLANK WITH RED X'S. NR 1 FMS WENT BLANK. WE SWITCHED TO SG2 AND DU 1, 2, AND 3 CAME BACK WITH RT SIDES INFO. CYAN (FGC A FAIL) AND (FADEC FAULT R-A) WAS OBSERVED IN CAS BOX. THE FADECS WOULD NOT RESET. 30 MINUTES LATER ON APPROACH LT SIDE INFO CAME BACK. GPWS NR 1 FAIL CAS MESSAGE, STAYS ON FROM 1000 FT UNTIL A/C SHUTDOWN. TROUBLESHOT TO PILOT'S SIDE IAC AND REPLACED PILOT'S IAC WITH A SERVICEABLE UNIT. MAINTENANCE IAW CE750 MM CHAPTER 34-25-01. OPS CHECKS GOOD.