As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU SHUTDOWN IN THE BLOCKS. TURNED APU SWITCH OFF (1 MINUTE), RE-ATTEMPTED START, FAULT LIGHT STAYED ILLUMINATED. NO START.(<P>OK TO DEFER APU IAW MEL 49-11-01A DUE TO AUTO SHUTDOWN. TRANSFERRED TO MDDR #119677 PER MEL 49-11-01A, CAT 'C', DUE DATE: 04-NOV-19.</P><P>LP 1218514 - M6: REMOVED AND REPLACED APU CONTROL UNIT (ECU) IAW BOEING 767 AMM 49-61-05, OPS CHECK GOOD. THIS CLEARS DMI #119677. PLACARDS REMOVED AND MCC NOTIFIED.</P>)