As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU FAILED TO START ON 03 ATTEMPTS ON PRE-FLIGHT - FAULT LIGHT ON.(<P>ITEM TRANSFERRED TO MDDR 128488 IAW MEL 49-11-01A DUE 27MAY20, CAT 'C'. FURTHER T/S REQUIRED.</P>) REMOVED AND REPLACED APU TRU IAW AMM 24-32-04 AND PERFORMED OPERATIONAL CHECK AND FOUND GOOD. THIS CLEARS DMI #128488. MCC NOTIFIED, PLACARD REMOVED.<BR DATA-MCE-BOGUS="1" /></P>)