What was found
IN CRUISE HAD DUAL FMC FAILURE, LEFT VTK AND MAP FLAGS. FOLLOWED QRH 11.30 RESTORED DUAL FMC OPERATION WITH FMC SWITCH BOTH ON R. FMC L BEARING AND DISTANCE INFORMATION DID NOT RESTORE. ACFT GROUNDED. RESET BOTH FMC IAW FIM 34-61, TASK 807. FMC-RT FAULT, RIGHT FMC LAST LEG AND GROUND FAULT IAW FIM 34-61, TASK 801. NO FAULTS LT FMC. REPLACED RIGHT FMC COMPUTER, REF MM 34-61-02 LOADED ALL REQUIRED SW INTO THE NEW FMC COMPUTER. OPS CK NORMAL, REF MM 34-61-00.