As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
REF ASA T/C # 78273000 #1 ENG SHOWS SHORT TIME FAULT MSG 73-11281, EEC CHANNEL IS NOT ENERGIZED WITH THE ALTERNATOR VOLTAGE. GROUNDED - YES. PER B737-800 FIM 72-27 TASK 805 REMOVED AND REPLACED #1 ENGINE EEC REF B737-800 AMM 73-21-60/401 EEC INSTALLATION TESTS COMPLETED.