As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LT FMC APPEARS FAILED. FMC MENU DISSAPPEARS AND REAPPEARS ABOUT 1 MINUTE LATER THEN DISAPPERAS AGAIN. VTK APPEARS ON LT NAV DISPLAY. ACFT GROUNDED. REPLACED THE NR 1 FMC COMPUTER IAW AMM 34-61-02-000-801. OPS CHECKED NORMAL IAW AMM 34-61-00/26. AFTER SEVERAL MINUTES MAP FLAG APPEARS ON F/O SIDE. MOVED FMC TRANSFER SWITCH TO BOTH ON RIGHT. FLAG CLEARS. RE-ENTERED LEFT FMC PERFORMANCE FACTORS IAW AMM 34-61-00. OPS CHECKED NORMAL.