As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLUID SAMPLE TAKEN AT 100 HOUR INTERVAL SHOW THAT THE PUMP NEEDS TO BE REPLACED. REPLACE PUMP AND BLED SYSTEM WITH SIGHT GAUGE INSTALLED IN RETURN LINE OF HYDRAULIC RIG TO HELP EVALUATE AIR REMOVAL FROM SYSTEM. WE WILL CONTINUE TO MONITOR FLUID SAMPLES. FAILED THEIR FLUID SAMPLES. (WEAR IN THE PUMP) PER 3M.