As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
A DUAL FADC ALT AS MACH FAILURE IN FLIGHT. THEY WERE ABLE TO WORK WITH GULFSTREAM SUPPORT & GET THE SYS RESET. TROUBLESHOOTING INDICATED THE THE CODES WERE POINTING TO A FAILURE OF THE NR 2 AIR DATA COMPUTER. THE DEFECTIVE COMPUTER WAS REMOVED PN 822-0374-457 SN 1032G & A REPAIRED UNIT WAS INSTALLED. OPERATIONS CHECKS WERE COMPETED. NO DEFECTS WERE NOTED.