What was found
AIRCRAFT ENROUTE FROM KVNY TO MMMY. WHEN A FGC #1 FAIL AMBER CAS MESSAGE APPEARED. CREW DECLARED AN EMERGENCY AND DIVERTED TO SDL AND LANDED WITHOUT FURTHER PROBLEM. THE CREW CONTACTED MX CONTROL AND DEFERRED FGC#1 PER MEL 22-1. AIRCRAFT RETURNED TO KVNY FOR NECESSARY REPAIRS. PERFORMED ASCB BUSS CHECK, WITH NO DISCREPANCIES. SWAPPED FGC #1 & 2, & PERFORMED AFGSC SYSTEM OPERATIONAL CHECK WITH NO DISCREPANCIES NOTED. ALL WORK ACCOMPLISHED IAW AMM 22-01-00. FGC'S REMAIN SWAPPED FOR TROUBLESHOOTING WITH NO FURTHER ISSUES AT THIS TIME.