As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) PRIOR TO DEPARTURE NOISE AND VIBRATION WAS OBSERVED COMING FROM THE AREA OF THE TURBOFAN. THE AIR CONDITIONING WAS SHUT DOWN AND THE PROBLEM DISAPPEARED. THE TURBOFAN WAS CHANGED AND THE FAULT CLEARED. THE FAILED UNIT EXHIBITED TURBINE BLADE TIP RUB PROBABLY DUE TO A FAILED BEARING IN THE FAN SHAFT.