What was found
AFTER TAKEOFF, FO MCDU FROZE ON THE LEGS PAGE. MCDU FROZE ON THE T/O PAGE, COULD NOT MANIPULATE ANY FMS FUNCTIONS ON EITHER. NO CIRCUIT BREAKERS TRIPPED. NO EICAS MESSAGES. MOCC ADVISE PULL L FMC E8, E9 R FMC E29, 30 SYSTEM RETURN NORMAL. PERFORMED FMC RESET IAW AMM 34-61-01-4, BOTH MCDU RESET IAW AMM 34-61-02-2, AND FMC SYS OPS TESTED IAW AMM 34-61-00-5, NO FAULT NOTED. ACFT OK FOR SERVICE. PERFORMED BOTH FMC RESET IAW AMM 34-61-01-4, BOTH MCDU RESET IAW AMM 34-61-02-2. FMC SYS OPS TESTED IAW AMM 34-61-00-5, NO FAULT NOTED.