As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU FAULT FIRST START. HUNG AT 40PCT. SECOND START OKAY. BIT THE BOX, NO FAULTS OR MESSAGES. STARTED APU TWICE AND START NORMAL. RAN APU FOR AN HOUR WITH A FULL ELECTRICAL LOAD. SHUTDOWN NORMAL. CHECKED CHIP DETECTORS AND DPI'S. NO PROBLEMS FOUND. OIL QUANTITY OKAY.