As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS IN FOR 500 HOUR INSPECTION. WHILE INSPECTING THE MAIN GEAR BOX COUPLING THAT DRIVES THE HYDRAULIC PUMP VIA A BELT AND PULLEY, THE PULLEY SURFACE WHERE THE BELT CONTACTS IT WAS FOUND TO BE UNUSUALLY ROUGH. THE BELT WAS ALSO INSPECTED AND FOUND TO HAVE AN ABNORMAL TEXTURE. IT IS SUSPECTED THAT DIRT AND DEBRIS MAY HAVE GOTTEN ON THE BELT AND DAMAGED THE PULLEY SURFACE. REPLACED PULLEY AND BELT.