As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT FMC FAILURE; VTK AND MAP FLAGS ON CAPT DISPLAY LOST LNAV/NAV RAN QRH 11.3-11.4 CONTINUED SINGLE FMC OPERATION. GROUNDED - YES. RETURNED FMC SWITCH TO BOTH PERFORMED AMM 34-61-00-860-801 NO HISTORY 30 DAYS, CONSIDERED NUISANCE ERROR, NOTIFIED.