As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOT EXPERIENCED LIMITED CONTROL MOVEMENT IN THE AFT-LEFT QUADRANT OF TRAVEL. A PRECAUTIONARY LANDING WAS MADE. MAINTENANCE DETERMINED THE CYCLIC FRICTION CUPS WERE DIRTY AND CAUSING RESISTANCE TO MOVEMENT. CUPS WERE CLEANED AND THE AIRCRAFT WAS RETURNED TO SERVICE.