As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU FAULT LIGHT. WILL NOT START. GROUNDED - YES. ACCOMPLISHED APU BITE FOUND ERROR CODE 49-41012 NO APU ROTATION SHUTDOWN. REMOVED AND REPLACED STARTER-GENERATOR REF B737-900 AMM 49-41-21/401. STARTER-GENERATOR INSTALL TEST COMPLETED - NO DEFECTS NOTED. CURRENT STATUS - NO FAULTS.