As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
STRONG HYD BURNING SMELL ON DESCENT ( APU SYSTEM - A319/A320/A321 WITHOUT MOD. 163213/MP J4530 )-PERFORMED OPERATIONAL CHECK OF APU IAW AMM 49-00-00 OPS TEST OK LEAK CHECK OK THIS CLEARS DMI 3335858-2 MOC NOTIFIED PLACARD REMOVED DMI LOGPAGE UPDATED