As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CAPTAIN'S FMC CDU WENT BLANK. "CALL AND FAIL" LIGHTS ILLUMINATED AFTER 30 SECONDS RETURNED TO NORMAL OPERATION. GROUNDED - YES. REF B737-900 FIM 34-61 TASK 803: PERFORMED LEFT CDU DISPLAY TEST, COLOR TEST, KEY TEST NOTING CORRECT OPERATION. PULLED/RESET 1 CB. LEFT CDU POWER UP SAFETY TEST SUCCESSFUL W/ NO DEFECTS OBSERVED. ETOPS GROUND VERIFICATION SUCCESSFUL.