As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RIGHT AT TOP OF DESCENT "VTK" FLAG APPEARED ON LEFT EFIS DISPLAY. BOTH FMC'S 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 "NML" AND ALL FMC EFIS HAD NORMAL DISPLAYS. REPLACED LEFT FMC PER 34-61-02. OP CHECKS GOOD. REFERENCE PREVIOUSLY SUBMITTED SDR ASAA0752390.