As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER STARTING THE HELICOPTER THE CYELIC STICK FELT STIFF AND SLUGGISH WHEN MOVED IN ANY DIRECTION. AFTER RUNNING FOR SEVERAL MINUTES THE CONTROLS FELT BETTER BUT NOT NORMAL AFTER REPLACING THE HYDRAULIC POWER PACK THE PROBLEM WEN AWAY. THE FILTER WAS REMOVED AND WHAT APPEARED TO BE VERY FINE METALLIC PARTICLES WERE PRESENT IN THE HYDRAULIC FLUID.