As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ENROUTE PHASE OF FLIGHT, VTK DISPLAYED ON CAPTAINS MAP FOLLOWED BY BOTH FMC'S BLANKED. FOLLOWED CHECKLIST WHICH HAD US PUT BOTH FMC'S ON THE "RIGHT". LEFT FMC RESTORED TEMPORARILY, BUT THEN FAILED AGAIN. WE THEN LEFT BOTH FMCS ON "RIGHT" SIDE. GROUNDED - YES. PERFORMED FIM 34-61 TASK 801 NO CURRENT FAULTS. FOUND TO BE ON INTERMITTENT FAULT LT FMC. FMC SWITCH BACK IN NORMAL POSITION.