As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AT FLIGHT LEVEL 350 RIGHT FMC FAILED FOR ABOUT 30 SECONDS WITH VTK DISPLAYED ON COPILOT MAP AND AUTOPILOT WENT INTO CWS MODE WITH LOSS OF LNAV AFTER 30 SECOND RIGHT FMC CAME BACK ONLINE WITH NO FAULTS AND OPERATED NORMALLY. GROUNDED - YES. RAN B737-800 FIM 34-61 TASK 836 CYCLED POWER TO R/T FMC, OPS RESTORED , CHECKS OK REF SAME.