As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU FAILED 3 START ATTEMPTS AT FL360. APU 60189 HAS EXHIBITED STARTING ISSUES SINCE LATE MAY. PRIOR TO THIS EVENT ECU MR49613-127 WAS REPLACED WITH MR49613-40 ON 6/8/08. THE -127 UNIT TESTED WITH NO FAULT FOUND. INLET PRESSURE SENSOR MR49533-225 WAS REPLACED WITH MR49533-75 ON 6/18/08. THE -225 UNIT TESTED WITH NO FAULT FOUND. THE STARTING ISSUES CONTINUED SINCE THIS EVENT ON 6/18/2008.