As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(AUS) RT ENGINE DRIVEN HYDRAULIC PUMP LEAKING FLUID FROM BETWEEN PARTING FACES. INVESTIGATION FOUND THAT A CHECK VALVE IN THE RT HYDRAULIC PUMP BYPASS LINE WAS BLOCKED BY DEBRIS FROM PREVIOUS PUMP FAILURES CAUSING A BUILDUP OF PRESSURE ACROSS THE PUMP WHICH COULD NOT BE BYPASSED THERE FORE CAUSING THE PUMP TO OPEN UP AT APARTING FACE AND ALLOW HYDRAULIC FLUID TO BE LOST.