As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ATTEMPTED TAKEOFF, COLLECTIVE LEVER MOVEMENT WAS RESTRICTED. TAKEOFF ABORTED, COLLECTIVE SERVO REPLACED. SHOP INSPECTION REVEALED SERVO BYPASS SPOOL WAS BINDING IN BYPASS SPOOL SLEEVE. THIS CAUSED PRIMARY CONTROL SPOOL HYDRAULIC NULL TO SHIFT LIMITING SERVO ACTUATOR MOVEMENT. SPOOLS AND SLEEVE CONTAMINATED WITH SOME TYPE OF COATING. THIS COATING COULD NOT BE SEEN, BUT WAS WASHED OFF. NORMAL SPOOLS AND SLEEVE OPERATION RESTORED. CAUSE UNKNOWN. (X)