What was found
DURING CRUISE NUMEROUS FLAGS AND LIGHTS MOMENTARILY ILLUMINATED ON BOTH NAV DISPLAYS AND CDU'S ASSOCIATED WITH FMC FAILURE. THE NR 1 FCC WAS THE MASTER AND THE AUTOPILOT REVERTED TO CWS. THE FMC(S) REGAINED NORMAL OPS TOO SOON FOR US TO ASCERTAIN IF ONE OR BOTH FMCS HAD FAILED. GROUNDED - YES. REF FIM 34-61 TASK 801. FMC BITE SHOWS NO CURRENT FAULTS. LEG 01 SHOWED: FMC-L PGM FAULT REF FIM 34-61 TASK 807. OPS TEST NORMAL. REF AMM 34-61-00. FMC OPS TEST NORMAL. DFCS BITE CHOWS NO FAULTS REF FIM 22-11-00-810-801.