As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MOMENTARY LEFT FMC FAIL. VTK ON CAPT NAV DISPLAY WITH NO FMC DATA ON FMC SCREENS. RECOVERED TO NORMAL OPS AFTER APPROX 30 SECONDS. GROUNDED - YES. FLIGHT 1 SHOWS "FMC-L, PRES POS LAT RATE". PERFORMED B737-900 FIM 34-61 TASK 824. NO FAULTS FOUND. ETOPS GRD VERIFICATION GOOD.