As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU HAD 2 AUTOSHUTDOWNS DURING CREW PREFLIGHT WITH LOW OIL PRESSURE MESSAGE 49-10270. OIL QTY NORMAL. FOUND LARGE SILVER COLOR METAL PARTICLES ON OIL SUMP MAGNETIC CHIP COLLECTOR. ALL OTHERS CHIP COLLECTORS CLEAN. ALSO MAIN OIL FILTER CONTAMINATED. REINSTALLED OIL FILTERS AND CHIP DETECTORS. REPLACED APU IAW MM.