As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON TAKEOFF THROUGH CLIMBOUT, CREW NOTICED A STRANGE SOUND. OUT OF APPROXIMATELY 10,000 MCL, VIBRATION INDICATOR ON NR 1 ENGINE CLIMBED STEADILY THROUGH 4.0 TO 5.0 AND EGT CLIMBED TO APPROXIMATELY 910 DEGREE C. BEFORE PULLING BACK ENGINE NR 1. ACCOMPLISHED QRH AND RETURNED TO FIELD AT CLT PER MOC. MAINTENANCE REMOVED AND REPLACED THE NR 1 ENGINE ASSEMBLY IAW J/C 03L50671001.