As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING ENG #1 START #1 ENGINE CONTROL LIGHT ILLUMINATED. GROUNDED - YES. PERFORMED ENG # 1 EEC BITE TEST IAW B737-800 AMM 73-00 TASK 801. FAULT CODE 75-20431 DISPLAYED. PERFORMED ACTUATOR TEST IAW AMM 71-00-00-700-807 ACTUATOR TEST PASSED, NO FAULT DISPLAYED. ENGINE CONTROL LIGHT OFF.