As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BEFORE TAKEOFF THE NR 1 ENGINE FEATHERED, FOLLOWED BY A POWERPLANT MESSAGE. REPLACED THE NR 1 ENGINE PEC IAW AMM 61-20-36-000-801 AND 61-20-36-400-801. PRIOR TO REMOVAL, FOUND FAULT CODES 270, 402, 338 ON CHANNEL A. CLEARED ALL FAULT CODES. RETURNED TO SERVICE.