As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IN CRUISE FLIGHT ENG L SYS FAIL MESSAGE. // TROUBLESHOOT PER FIM 71-00 TASK 802. RECEIVED EEC-1 CURRENT FAULT 732177 IOP BOX FAULT. REMOVED AND REPLACED LH ENG IOP BOX IN REF WITH AMM 73-21-11-400-801. OPS CHECK GOOD. NO FAULT. OK FOR SERVICE.