As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON INITIAL CLIMBOUT, A POWERPLANT MESSAGE ON THE ED. RETURNED TO FIELD. LANDING UNEVENTFUL. INTERROGATED CDS AND FOUND FAULT 778 ON NR 1 ENG BOTH CHANNELS. DUE TO HISTORY OF NEWLY INSTALLED P 2.2 VALVE, PER REQUEST REMOVED AND REPLACED THE P 2.2 VALVE IAW AMM TASK 75-31-11-000 & 400-801. GROUND RAN ENGINE , NO POWERPLANT MESSAGE, NO FAULT CODES IN CDS. RETURNED TO SERVICE