As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ETOPS SIGNIFICANT SYS - DURING OVERNIGHT MX APU FAILED TO START. IN DICATED 20 PERCENT RPM BUT NO LIGHTOFF. T/S IAW FIM 49-61-05 FIG 107. REPLACED IGN PLUG IAW MM 49-41-02 NO HELP. REPLACED LEAD IAW MM49-41-01, NO HELP. REPLACED EXCITER IAW MM 49-41-03. OPS CK NORMAL.