As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT FMC FAIL DISPLAYED BUT NOT MAP. FMC ON BOTH CDU'S GONE. NO LNAV ON LEFT NAV DISPLAY BUT LNAV INFO ON RT NAV DISPLAY. LNAV, VNAV DISENGAGED. SWITCHED TO B AUTOPILOT-LNAV, VNAV RE-ENGAGED BUT NO FMC ON EITHER CDU UNTIL FMC BOTH ON RT SELECTED. ACFT GROUNDED. REF FMC BITE FIM 34-61 TASK 837. COULD NOT DUPLICATE. OPS TEST NORMAL.