As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
TURN ON EEC MAIN POWER SWITCH ON P61 TO ALTERNATE POSITION, ECPS PAGE LT ENGINE HAS NO HIGH LIGHT ON ANY CHANNEL AND NO LT EEC POWER MESSAGE ON UPPER EICAS. TRIED LT PDIU UNIT, NO HELP. REPLACED ENG 1 EEC UNIT, NO HELP. LT EEC POWER MSG APPEAR ON UPPER EICAS NORMALLY WHEN EEC ALTN POWER IS ON.