What was found
BINDING IN FLIGHT CONTROLS NOTICED AT FL335 TEMP WAS -47C @ FL335 NARRATIVE: AFTER PROLONGED STABLE CRUISE FLIGHT AT FL390 DESCENT WAS GIVEN TO FL330 AT FL335 WE ENCOUNTERED LIGHT TURBULANCE IN CONJUNCTION WITH A TURN AS YOKES WAS DISPLACED LEFT TO RAISE RIGHT WING FROM TURN A TACTILE THUD WAS FELT IN COCKPIT FLOORBOARD AND A VISIBLE RACHETING/JOLT WAS SEEN IN CONTROL COLUMN AS THE FLIGHT CONTROLS. PERFROMED A GVI OF THE AILERON PCU AND MOVED CONTROL COLUMNS FOR BINDING. NO DISCREPANCIES FOUND ALL WORK IAW AMM 27-10-00. REINSTALLED AILERON PCU PANEL 641BB IAW AMM 27-12-01.