As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
VTK OBSERVED ON FIRST OFFICER'S NAV DISPLAY WITH CORRESPONDING LOSS OF VNAV LNAV. SYSTEM SELF CORRECTED AFTER A COUPLE OF MINUTES. GROUNDED - YES. VERIFIED R FMC HAD AN INTERMITTENT FAULT (PRES POS LAT RATE FAULT) CYCLED BOTH FMC C/B'S. ACCOMP FMC SENSOR TEST, TEST PASS ALL SHOW OK REF B737-900 FIM 34-61 TASK 801 & FIM 34-61 TASK 824.