What was found
INFLT BOTH FMC WOULD RESET APROX EVERY 5 MIN CAUSING AUTOPILOT EICAS MESS.AND DISCONNECT GPS R WITH MX CODES 211591 & 221591. CODE BREAKDOWN INDICATES L AND R FMC FAILURES. PER FIM 22-02 TASK 808, BLOCKS 12, 117, & 118, LEFT AND RIGHT FMCS REQ REPLACEMENT. PERF'D MCDP LAST FLT FAULTS BITE FIM 22-02 TASK 801, FOUND FOLLOWING FAULTS: FMC L-R CH WITH MX CODES 110071, 130071, 120081; FMC R/TMC WITH MX CODE 310081; FMC L-R CH WITH MX CODES 110081, 130081, & 120071; GPS L WITH MX CODES 211581 & 221581; REF L/P'S 4651051 & 4651061, LEFT AND RIGHT FMCS REPLACED, ALL OPS CKS GOOD, NO FURTHER DEFECTS NOTED AT THIS TIME. FMCS CONSIDERED ETOPS SIGNIFICANT. ETOPS VERIFICATION FLIGHT SUCCESSFUL.