As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FOLLOW UP TROUBLESHOOTING FOR REPETITIVE APU AUTO SHUTDOWNS WITH FAULT LIGHT DUE TO OIL TEMP FAULTS. GROUNDED - YES. REMOVED AND REPLACED APU ENGINE WIRE HARNESS REF B737-900 AMM 49-11-01/401. PERFORMED APU OPERATIONAL TEST REF AMM 49-11-00-710-801. OPS CHECK GOOD. PERFORMED APU BITE PROCEDURE REF AMM 49-61-00-700-801, NO CURRENT FAULT MESSAGES FOUND.