As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU FAILED ON GROUND AFTER RUNNING NORMALLY FOR ABOUT TEN MINUTES. RAN APU APPROX 10 MIN. LOW OIL PRESSURE SHUTDOWN. MAINT MSG 49 91007. REF FIM TASK 49 90 00. APU WAS OVERSERVICED. DRAINED OIL TO FULL MARK. INSPECTED MAGNETIC DRAIN PLUG. NO DEFECTS NOTED. REPLACED OIL PRESS SWITCH AS PRECAUTION. REF MM 49 94 22, NO LEAKS NOTED. RAN APU 3 TIMES 15 MINS EACH OPS NORMAL.