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 FOUND SHORT TIME FAULT 73-21281 ENG 1 EEC CHANNEL IS NOT ENERGIZED WITH THE ALTERNATOR VOLTAGE. FAULT SET LEG 0,1 &3. GROUNDED - YES. SHORT TIME FAULT CODE 73-21281 PLACED ON PLT FOR NLT 50 FH, REF T/C 78273000. PERFORMED EEC BITE TEST FAULT HISTORY REF B737-900 AMM 73-21-00, VERIFIED NO FAULT WITHIN LAST 3 LEGS ON ENGINE #1, THIS CLEARS PLT DEFERRAL.