As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT FMC FAILED ENROUTE FOUR TIMES, RECOVERED AFTER 90 SECONDS EACH TIME LEFT VTK FLAG LNAV R NAV DISENGAGED AT UNIT ON CENTER UPPER DU FO STILL HAD MAP DATA. ACFT GROUNDED. INFLIGHT FAULT CHECK SHOWS NO FAULTS LAST 9 FLIGHTS. ACCOMPLISHED FIM 34-61 TASK 836, TESTS PASSED.