What was found
AIRCRAFT GROUND EVENT IN SNA, THE APU AUTO SHUTDOWN FOR HIGH OIL TEMPERATURE INDICATION AND FAULT CODE 49-91005. MAINTENANCE PERFORMED FIM TASK 49-90-00-810-801, REMOVED AND REPLACED THE APU OIL COOLER PER AMM 49-91-41-000-801. MAINTENANCE ALSO REMOVED AND REPLACED THE APU OIL TEMPERATURE CONTROL VALVE PER AMM 49-91-21-000-801. NO DEFECTS NOTED ON GROUND RUN. AIRCRAFT WAS RETURNED TO SERVICE. A FLIGHT VERIFICATION WAS COMPLETED.