As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DUAL CDU FAIL W/ VTK ON BOTH MFD'S. A/T LIMITS MESSAGE ON UPPER DU. BOTH SYSTEMS RESTORED WITHOUT PILOT ACTION IN APPROX 30 SECONDS. DID NOT LOSE LNAV/VNAV. GROUNDED - YES. PERFORMED B737-900 FIM 34-61 TASK 807. FAULT DEEMED TO BE INTERMITTIENT. NO HISTORY LAST 30 DAYS. OPS CHECKS GOOD. NO FAULTS NOTED.