As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE PERFORMING T/C 78273000 FOUND ENG 1 "CH A" EEC DATA NOT AVAILABLE CAN NOT ACCESS CH "A". GROUNDED - YES. CONFIRMED #1 ENG EEC CHAN "A" NOT RESPONDING. REPLACED EEC REF B737-800 AMM 73-21-60-000-801-F00/73-21-60-400-801-F00. C/W POWER PLANT TEST TABLE REF AMM 71-00-00-800-811-F00. ALL TESTS PASSED. CONFIRMED CHAN A FUNCTIONS NORMALLY. NO FURTHER DEFECTS NOTED.