As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER STARTING THE APU THE BLUE MAINT LIGHT CAME ON. AFTER WE SHUT DOWN THE APU THE FAULT LIGHT ILLUMINATED. GROUNDED - YES. REMOVED AND REPLACED APU STARTER GENERATOR. REF B737-800 AMM TASK 49-41-21-000-881 AND AMM 49-41-21-400-801. NO HELP. REMOVED AND REPLACED START CONVERTER UNIT IAW AMM 49-41-61. INSTALLATION TEST GOOD PER AMM 49-41-61 STARTER GEN OPS CHECKS GOOD PER AMM 49-41-21. ETOPS GROUND VERIFICATION GOOD.