As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AT FL 370 JUST PRIOR TO DESCENT, L FMC FAILED 3 TIMES IN 2 MINUTES. VTK, MAP AND BOTH FMC PROMPTS ERASED. NORMAL OPS RESTORED EACH TIMES WITH NO PILOT ACTION. NOTE: APPROACH WAS NOT LOADED UNTIL DESCENT WINDS WERE EXECUTED. GROUNDED - YES. REF B737-800 FIM 34-61 TASK 836. RESET BOTH FMC'S OPS CHECK NORMAL.