As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SERVO ACTUATOR REMOVED FROM AIRCRAFT DUE TO BINDING IN COLLECTIVE LEVER. CIRCUMSTANCES UNKNOWN. SHOP INSPECTION REVEALED SERVO BYPASS SPOOL WAS BINDING IN BYPASS SPOOL SLEEVE. SPOOLS AND SLEEVE CONTAMINATED WITH SOME FORM OF COATING. THIS COATING COULD NOT BE SEEN, BUT WAS WASHED OFF. NORMAL SPOOLS AND SLEEVE OPERATION RESTORED. CAUSE UNKNOWN. (X)