As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU SHUTDOWN APU AUTO-SHUTDOWN HAS OCCURRED. REFERENCE LOGIC DESCRIPTION FOR DETAILS. ADVISORY CREW COMMENTS: ELEC AND AIR START FAIL MSG-4910440 INACTV ER MODE MSG-4907940 INACTV ER MODE. FOUND FOLLOW PRESENT LEG MESSAGE:49-12970,49-07940,49-10440. REPLACED WITH NEW IGNITION CLUSTER AND INSTALLATION TEST OK, REPLACED WITH NEW FUEL CLUSTER AND TEST OK.