As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AT FL350 RIGHT FMC VTK DISPLAYED ON RIGHT NAV DISPLAY. LNAV DISCONNECT. TRANSFERRED AUTOPILOT TO A AUTOPILOT. AFTER 3 MINUTES, FMC RECOVERED TO NORMAL. GROUNDED - YES. T/S PER B737-900 FIM 34-61 TASK 836. BOTH FMC'S CK'D GOOD, FMC SELECTION APPEARS ON BOTH MCDU'S.