As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
2 HRS INTO FLIGHT CAPT OUTBD DISPLAY "CWS R" WITH REVENT TO "MCP SPD" AND "ALT HOLD." CAPT INBD DU "VTK " THEN FMC GO TO "MENU" PAGE - BOTH FMC'S THEN TRACK DISPLAY DISAPPEARS ON CAPT THEN F/O SIDE QRH FMC FAIL LEADS TO "FMC BOTH ON 2" SWITCHED BACK TO NORMAL REOCCURS A SECOND TIME. GROUNDED - YES. PEFORMED FIM 34-61 TASK 836 AND BOTH FMCS OPS CK NORMAL DUAL OPS RESTORED GROUND FUNCTIONAL CK GOOD.