As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) DURING TAXI THERE WAS AN ODOUR OF OIL AND A DROP IN NR1 ENGINE PARAMETERS. GROUND INSPECTION FOUND THE TURBOMACHINERY CHIP DETECTOR AND THE NR4/5 SCAVENGE LINES HEAVILY CONTAMINATED WITH METAL. FURTHER INVESTIGATION FOUND THE PT SHAFT HAD FRACTURED IN THE VICINITY OF THE NR4 BEARING.