As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF APU OIL PRESS INDICATION FOLLOWED BY AUTO SHUTDOWN. INVESTIGATION OF APU OIL FILTER AND OIL FOUND 6 BALL BEARINGS CAME OUT DURING DRAINING OF APU OIL. AN APU LOANER WAS INSTALLED, AND THE DEFECTIVE APU SENT OUT FOR REPAIR. FACILITY PERFORMING REPAIR FOUND DEFECTIVE STARTER CLUTCH SHAFT BEARING FAILED. IT WAS REPLACED USING AN UPGRADED PART PER S/B 49-6114.