As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMB THROUGH FL25000, PILOT REPORTED THAT THE NR 1 ENGINE WENT TO IDLE AND STARTED TO RUN ROUGH. MAINTENANCE REMOVED AND REPLACED THE NR 1 ENGINE AND PERFORMED OPERATIONAL TEST IAW MP71042-01 AND MP71042-02 AND PERFORMED ENGINE IDLE LEAK CHECK IAW AMM 71-00-00-710-006.