As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU AUTO SHUTDOWN AT GATE. BITE APU IAW FIM HIGH OIL TEMP FAULT IAW FIM 49-11-00, FIG 110. NO OTHER FAULTS FOUND. IAW FIM REPLACED OIL COOLER BYPASS VALVE IAW AMM 49-27-10. LEAK CHECKED FAILED. REPLACED OIL COOLER BYPASS VALVE WITH ANOTHER NEW VALVE LEAK CHECKED GOOD & APU OPS GOOD.