As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CAPTAINS CDU HAS CYCLED FROM BLANK SCREEN BITE TEST AND NORMAL OPERATION MULTIPLE TIMES. COULD NOT DUPLICATE DEFECT. FMCS INFLT REVIEW SHOWS L/H CDU FAULTS LAST 2 FLT LEGS. PRECAUTIONARY REPLACED LT CDU REF MM: 34 61 01, OPS CHECK NML.