As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) DURING GROUND OPERATION APU BEGAN TO VIBRATE WITH OIL SMOKE FROM EXHAUST. APU AUTO SHUT DOWN CARRIED OUT. APU CHIP DETECTOR REMOVED, FOUND CONTAMINATED WITH FERROUS CHIPS AND FUZZ, OIL NOTED LEAKING FROM PLENUM DRAIN. APU REMOVED FROM AIRCRAFT AND SENT TO REPAIR FACILITY FOR EVALUATION AND REPAIR. WAITING ON RESULTS OF TEAR DOWN REPORT.