As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
F/O NAV DISPLAY ANNUNCIATED VTK AND RECEIVED FMC P/RST LIGHT FOR A FEW SECONDS. L NAV AND V NAV DISENGAGED. ALL INDICATIONS RETURNED TO NORMAL WITHOUT ANY C/A TAKEN. L NAV AND V NAV RE-ENGAGED WITH NO FURTHER PROBLEMS. ACFT GROUNDED. PERFORMED FMC OPERATIONAL TEST IAW AMM REF 34-61-00, OPS CK PASSED. CKS GOOD FOR SERVICE.