As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) DURING ROUTINE MAINTENANCE WORN SPLINES WERE FOUND. NOTE: THESE SPLINES DRIVE THE HYDRAULIC PUMP. TACH GENERATOR WAS REMOVED AND SENT FOR OVERHAUL. PART WAS RETURNED 2 MONTHS LATER WITH NEW PAINT AND THE SAME WORN OUT SPLINES. OLD GREASE WAS STILL IN THE WORN SPLINES.