As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CRUISE FLIGHT LNAV & VNAV KICKED OFF & VTK DISPLAYED ON FO'S ND DISPLAY FOR ABOUT 10 SECONDS THEN WENT AWAY & OPS RETURNED TO NML. GROUNDED - YES. PERFORMED B737-900 FIM 34-61 TASK 801. BITE SHOWS "FMC-R PRES POS LAT RATE" ON FMC-L LAST FLIGHT. FIM 34-61 TASK 824 CHECKED GOOD, NO FAULTS NOTED IN ADIRS BITE, REF B737-900 AMM 34-21 TASK 801. ETOPS GRD VERIFICATION OF FMCS NML.