As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU FAULT LIGHT ILLUMINATED DURING START AFTER LANDING. ACFT GROUNDED. PERFORMED BITE CHECK ON APU, FOUND FAULT CODED 49-41011. FOUND NO IGNITION AT EXCITOR UNIT. R & R APU EXCITOR REF MM 49-41-31. OPS CHECKS NORMAL. GROUND VERIFICATION CHECKS NORMAL.