As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON PREFLIGHT, A LEFT CDU FAIL LIGHT CAME ON. PERFORMED DFCS BITE PROCEDURE REF SIM TASK 22-11-801. NO CURRENT FAULT. PERFORMED FMC BITE FAULT ISOLATION FIM TASK 22-11-811. NO FAULTS NOTED AFTER INITIAL EVALUATION. PERFORMED FMCS FLIGHT MANAGEMENT SYS BITE TEST REF SIM TASK 34-61-801. NO CURRENT FAULTS. GROUND VERIFICATION CHECKS GOOD.