As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CSS REQUESTED: APU FAILED TO START 3 TIMES ALL AT F2400. GROUNDED - YES. REF TO LOG PAGE 60234860, REMOVED AND REPLACED APU STARTER CONVERTER UNIT PER B737-900 AMM 49-41-61 PB400. OPS CHECK PASSED. ETOPS GROUND VERIFICATION SUCCESSFUL.