As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU INOP. AUTO SHUTDOWN 10 SECONDS AFTER REACHING 95 PERCENT RPM. APU FAULT LIGHT ON. APU WOULD NOT STAY RUNNING. APU FAULT EICAS MESSAGE. NO TIME TO T/S ON ACCT OF TOW ACTIVITY WITH THIS ACFT. FOUND HEAVY METAL PARTICLES OVER .050 ON MAIN GEAR BOX CHIP DETECTOR. REPLACED APU IAW AMM.