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 ATTEMPTS, NO ROTATION FAULT LIGHT ILLUMINATED. ACFT GROUNDED. INTERROGATED CDU, FOUND FAULT 49-41011, NO FLAME SHUTDOWN. CURRENT STATUS NO FAULTS AND NO MAINT HISTORY. CHANGED THE IGNITOR PLUG AND LEAD IAW AMM 49-41-54/49-41-52. CHANGED THE EXCITER BOX IAW AMM 49-41-31. RAN APU FOR 5 MINUTES WITH PACKS ON HIGH. OPS CHECKED GOOD.