As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU HAD SHUTDOWN, FAULT LIGHT ILLUM AND EICAS MSG. APU FAULT DISPLAYED. APU REMOVED FROM AIRCRAFT FOR METAL ON CHIP DETECTOR. COMPOUND GEAR IN GEARBOX FAILED AND CAUSED AUTO SHUTDOWN. GEARBOX AND COOLING FAN TSHM=6337 HRS AND CSHM=8381.