As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AT CRUISE ALT FL350, /O'S NAV DISPLAY SHOWED VTK MSG LIGHT ILLUMINATED AND INTERMITTENT SINGLE FMC OPERATION DISPLAYED ON MCDU. FOLLOWED QRH PROCEDURES AND HAD DUAL OPS RESTORED. GROUNDED - YES. VERIFIED FMC -R SHOWED A RE-SYNC IN FLT. OPS NORM R. FMC BITE CK OK REF B737-800 AMM TASK 34-61-00-860-801.