As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU FAIL TO START WITH FAULT LIGHT ILLUMINATING. ACCOMPLISHED FIM 49 40 00 810 802. VERIFIED FAULT 49 41011 STILL ACTIVE. APU GOES THROUGH START SEQUENCE DOOR OPEN CRANKING AND FUEL FOG AT TAILPIPE BUT NO IGNITION SOUND NOTED. REPLACED APU EXCITER REF MM49 41 31. OPS NORMAL.