As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ENROUTE AT FL 360, SAT -60 ATTEMPTED THREE APU CSS. ALL THREE ATTEMPTS NO START. WITH A APU FAULT LIGHT ON AFTER EA START. FAULT LIGHT WENT OUT WITHIN 5 MINUTES OF EA ATTEMPT. ACFT GROUNDED. FOUND FAULT CODE 49-41012. ACCOMPLISHED TASK 49-40-803. APU STARTED ON GROUND. APU IGNITION WAS ERRATIC. REPLACED STARTER GENERATOR IAW MM 49-41-21. APU STARTS NORMAL.