As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU AUTO SHUTDOWN. MAT SHOWS 49-10260, HIGH OIL TEMP. RE-STARTED WITH SAME RESULTS. REPLACED OIL FILTER, CHANGED OIL IN APU. CHECKED CHIP DETECTORS. LEAK CHECKED OKAY. RAN APU FOR AN HOUR, NO PROBLEMS FOUND, GROUND CHECK NORMAL. PERFORMED PER MM, PROBLEM STILL EXISTS. REOPENED BY OPBLM. APU OIL INDICATION INOP. PLEASE CHECK AIR INLET PATH FOR BLOCKAGE & AIR-OIL COOLER. IF OK, REPLACE THERMAL BYPASS VALVE. INCLD FNDG'S IN ACP W-U. MCD COVERED WITH METAL. REPLACED APU IAW MM. OPS CKS OK.