As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APPROXIMATELY 2 HRS INTO FLIGHT, CAPT'S CDU BLANKED OUT FOR 5-10 SECONDS. CALL & FAIL LIGHTS ILLUMINATED ON LT SIDE OF KEYPAD. CDU RETURNED TO NORMAL OPS WITHIN 10 SECONDS. HAPPENED ON, 2, SEPARATE OCCASIONS. ACFT GROUNDED. REF AMM 34-61-01 REMOVED CAPT CDU. INSTALLED SERVICEABLE UNIT CAPT LT CDU POSITION. CDU INSTALLED IAW AMM 34-61-01. CDU SOFTWARE CONFIGURATION CHECK C/W REF AMM 34-61-00. ACFT GROUND VERIFICATION CHECKS OK, OK FOR CONTINUE SERVICE.