As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BOTH EEC LIGHTS ON "ALTN" AFTER ENGINE START. PERF ALTN MODE LT ON FIM 73 05 00 810 811 F00 DUE TO CODE 73 31 641 AND 73 31 642 PERF EEC TEST AMM TASK 73 21 00 700 804 F00 BOTH ENGINES AND CH A AND B. NO DISCREPANCIES NOTED. EEC TEST PASS.