As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU FAILED TO START FL 350 WITH FAULT LIGHT. ACFT GROUNDED. FAULT CODE INDICATED 49-41250 SCU SHOWS START SYS INOPERATIVE. R & R THE APU STARTER GENERATOR, REF AMM 49-41-21-000-801 AND 49-41-21-400-801. APU LEAK AND INSTALLATION TEST GOOD FOR APU STARTER/GENERATOR, REF AMM 49-41-21-400-801.