As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CRUISE, FMC P/RST ILLUMINATED, ALONG WITH VTK ON F/O'S DISPLAY. LNAV AND VNAV DISCONNECTED. SWITCHED TO A AUTOPILOT AND INDICATIONS DISAPPEARED AND SYSTEM RETURNED TO NORMAL AFTER ABOUT 30 SECONDS. OPERATED NORMALLY FOR THE REST OF THE FLIGHT. ACFT GROUNDED. NR 2 FMC LOGGED ONE FAULT LAST FLIGHT - SYSTEM OPS OK.