As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU FAULT LIGHT ON START. LOW OIL PRESSURE. ACFT GROUNDED. APU BITE WAS PERFORMED REF FIM 49-60, TASK 801, 2 FAULT CODES FOUND 49-31175 & 49-41011, R & R IGNITER LEAD & IGNITER IAW MM 49-41-52-000-801/400-801 AND MM 49-41-57-000-801. R & R IGNITION UNIT IAW AMM 49-41-31. R & R APU FUEL CONTROL IAW AMM 49-31-11. APU STARTS NORMAL. APU BITE SHOWS NO FAULTS. ACFT OK FOR SERVICE. LEAK CHECK GOOD ON FUEL CONTROL.