As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
F/O "VTK" FLAG ON MFD FOLLOWED BY "MAP" FLAG. NO BRG OR DIST ON EITHER RT OR LT FMC ON THE POS SHIFT PG 3/3. ACFT GROUNDED. PERFORMED FMC BITE/CURRENT STATUS. ALL SYS OK. IAW FIM 34-61 TASK 801. PREVIOUS FLT SHOWED FMC-LT FAULTING FMC-R FOR "DATE" RATE AND FMC-RT FAULTING FMC-LT FOR THE SAME. VERIFIED NUISANCE FAULT WITH AOG ENG.