As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AT TOP OF DESCENT "VTK" FLAG APPEARED ON LEFT EFIS DISPLAY. BOTH FMC DISPLAYS DEFAULTED TO THE "MENU" PAGE. THREW FMC SWITCH TO "BOTH ON RIGHT" MESSAGE NOTE OF "SINGLE FMC OPS" FOLLOWED BY "DUAL FMC OPS RESTORED". RETURNED FMC SWITCH TO "NORMAL". OPS NORMAL. BOTH LT & RT FMC COMPUTERS LOGGED "L FMC FAILED". DEFERRED MAINTENANCE. LT FMC ON MEL PENDING ENGINEERING EVALUATION. REMOVED AND REPLACED LEFT FMC PER AMM REF 34 61 02