As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE ACCOMPLISHING T/C 78273000 FOUND FAULT CODE 73-20171 INTERNAL EEC FAULT LONG TIME FAULT FOR NR 1 ENGINE. VERIFIED FAULT 73-20171 STILL CURRENT IAW FIM 73-21TASK 801. REPLACED THE NR 1 ENGINE EEC IAW AMM 73-21-60. GROUND VERIFICATION SUCCESSFUL IAW AMM 71-00-00 ,& 73-21-00. EEC SOFTWARE VERIFIED TO BE CORRECT.