What was found
AT CRUISE FL 340 FMC DID A RESTART. VTK ON CA ND AND BOTH FMC'S WENT TO MENU PAGE. A/T LIMIT LIGHT ILLUMINATED. FMC'S RETURNED TO NORMAL AFTER 15 SEC. GROUNDED - YES. PERFORMED FMC OPERATIONAL TEST. FMC LEFT AND RIGHT AND L AND R DPC TEST OK IAW B737-9 AMM TASK 34-61-00-710-801. PERFORMED AUTOTHROTTLE OPS TEST. TEST NORMAL IAW AMM TASK 22-31-00-710-801. NO FLIGHT DECK EFFECTS FOR VTAK IAW B737-9 IFIM TASK 31-00-00-810-803.