As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING FLIGHT CONTROL CHECK, AILERONS STIFF BOTH LEFT AND RIGHT. SHUDDERING FELT AS AILERONS MOVED. AIRCRAFT BACK TO BLOCK AND GROUNDED BY MAINTENANCE. AFTER INSPECTING LH + RH AILERONS WHILE MOVING FOR BINDING, OR BYPASS OF PDU NO DEFECTS NOTED. AILERONS OPERATE NORMALLY NO DEFECTS PER B767 AMM 27-11-00. AIRCRAFT RELEASED FOR FLIGHT.