As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU WILL NOT START, ON GROUND, FAULT LIGHT ILLUMINATED. ACFT GROUNDED. REPLACED AUX AND MAIN BATTERIES IAW AMM 24-31-11, BATTERIES OPS CHECK GOOD IAW SAME REFERENCE. PERFORMED APU STARTING AND OPERATION IAW AMM 49-11-00, OPS CHECK GOOD.