As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE PERFORMING T/C 05-020-01. FOUND SMT ON ENG #1. "ENG 1 EEC C2" - LONG TERM FAULT. GROUNDED - YES. DEFERRED PER T/C 05-020-01. REPAIR WITHIN 225 FLIGHT HOURS. AFTER PERFORMING B737-9 IFIM TASK G73-10-00-810-803 NO LATCHED MESSAGES FOUND & NO MAINTENANCE ACTION REQ FOUND TO BE INTERMITTENT FAULT.