What was found
(CAN) FLIGHT CREW REPORTED AILERON CONTROL HAD AN ODD FEELING IN FLIGHT, SOMEWHAT STIFF AND HEAVY. UPON AN UNEVENTFUL LANDING, MAINTENANCE PERSONNEL CARRIED OUT A FULL OPERATIONAL CHECK OF THE ROLL CONTROL SYSTEM I.A.W DH8 AMM 27-10-00-06 WHICH INCLUDED CHECKING THE FORCE REQUIRED TO MOVE THE CONTROL COLUMN/WHEEL IN EITHER DIRECTION, CABLE TENSIONS ETC. DURING THE OPERATIONAL CHECK OF THE AILERONS, IT WAS NOTICED THAT THE LH AILERON QUADRANT WAS ROUGH AND STIFF. THE BEARINGS ON THIS QUADRANT INPUT PULLEYS FOUND SEIZED. THE LH AILERON QUADRANT ASSEMBLY WAS REPLACED AS AN UNIT. CABLE TENSIONS ADJUSTED I.A.W DH8 AMM 27-00-00 AND AILERON SYSTEM RIGGED I.A.W DH8 AMM CHAP 27-12-00. (TC# 20190802005)