As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NR 2 FMC FAIL WITH "MAP" FLAG AND "SINGLE FMC OPERATION" IN SCRATCHPAD. GROUNDED-YES. PERFORMED B737-800 FIM 34-61 TASK 801, BOTH FMC'S OPERATIONS NORMAL. SINGLE FMC MESSAGE AND MAP FLAG BOTH EXTINGUISHED. ETOPS SIGNIFICANT SYSTEM-GROUND VERIFICATION OPERATIONS NORMAL.