As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU FAILED TO START & A LOW OIL PRESSURE AMBER LIGHT ILLUMINATED. ACFT GROUNDED. VERIFIED APU OIL LEVEL FULL. INTERROGATED FAULTS AND NO DEFECTS NOTED IN HISTORY OR CURRENT FAULTS. COMPLIED WITH APU OPS TEST IAW AMM 49-11-00, OPS TESTED GOOD.