What was found
PERFORMED TASK CARD 78273000, ENG #1 HAS FAULT CODE 73-21281 EEC CHANNEL IS NOT ENERGIZED WITH THE ALTERNATOR VOLTAGE. SHORT TIME. GROUNDED - YES. INTERROGATE FMC FOR FAULTS, FAULT MSG 73-21281 LOGGED ON FLT LEG # 0,1,2 AND 4. ACCOMPLISHED B737-800 FIM 73-27 TASK 804 AND 805. ALL RESISTANCE CHECKS ARE WITHIN ACCEPTABLE LIMITS GVI OF ELECTRICAL CONNECTORS NML, NO FAULT FOUND. REMOVED AND REPLACED EEC REF B737-800 AMM 7321-60/401. EEC SOFTWARE VERIFICATION COMPLETE. EEC INSTALLATION TEST GOOD IAW AMM 73-21-00-700-808-F00, NO FAULTS PRESENT. GROUND VERIFICATION SUCCESSFUL.