As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU HAD NO LIGHT OFF. PREFORMED OPS CHECK IAW AMM 49-11-00-802-002. APU SPOOLED TO 14 PERCENT AND NO FURTHER WITH NO AUDIBLE IGNITER INDICATION. PERFORMED BITE TEST IAW 49-11 FT & 958. LAST RUN FAULT NO LIGHT OFF WITH MINI FLAG OK. REMOVED AND REPLACED APU IGNITER AND EXCITER BOX IAW AMM 49-41-01 AND AMM 49-41-03. PERFORMED SATISFACTORY APU STARTING, OPS CHECK GOOD.