As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU INOPERATIVE: MAINT MGS 49-41251 START CONVERTER UNIT SHOW HIGH TEMPERATURE NO APU ROTATION SHUTDOWN. ACFT GROUNDED. REMOVED, REPLACED, AND TESTED START CONVERTOR UNIT IAW MM 49-41-61-400-801. TESTS PASSENGER ETOPS SIGNIFICANT SYSTEM GROUND VERIFICATION SUCCESSFUL.