As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU AUTOSHUTDOWN WITH APU BATTERY MESSAGE AND APU BATTERY CHARGER MESSAGE. REPLACED APU BATTERY AND BATTERY CHARGER, NO HELP. CHECKED APU OIL LEVEL ON APU PAGE, NO OIL SHOWS. CHECKED APU NO OIL IN SIGHT GLASS, CHECKED MASTER CHIP HAS METAL. REPLACED APU PER MM, OPS NORMAL.