As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU AUTO SHUTDOWN ON START AT 30 PERCENT. APU WILL NOT START, STARTER TURNS BUT WON' T ROTATE GEAR BOX. SUSPECT SHEARED STARTER SHAFT. REPLACED STARTER, NO HELP. FOUND STARTER GEAR BOX CHIP DETECTOR FILLED WITH LARGE METAL SHAVINGS. REPLACED APU.