As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
TWO ATTEMPTS TO START APU RESULTED IN TWO APU FAULTS, NO START. GROUNDED - YES. R & R STARTER-GENERATOR IAW B737-900 AMM 49-41-21 REF B737-900 FIM 49-40 TASK 803. APU OPS AND LEAK CHECKED GOOD. STARTER-GENERATOR PART NUMBER VERIFIED. REF DEFECT 60035943 FOR MEL 49-99A. REMOVED MEL PLACARDS.