What was found
ACFT HAD DEAD SPOT LT AILERON ROLL. PITCH TRIM STIFF & OVER RESPONSIVE TO UP. MX OP CHECKED ROLL SPOILERS & CHECKED RIGGING OF AILERON CABLE CIRCUIT. CABLE TENSION ADJ FROM CONTROL WHEEL TO SPLITTER QUADRANT. TRIM CABLES, TRAVELS & RIGGING CHECKED. AILERON TRAVELS CHECKED ALONG WITH OPS CHECK OF SPOILER CUTOUT AT 140 KTS. AILERON CONTROL CIRCUIT UNDER COCKPIT FLOOR CHECKED & VISUALLY INSPECTED. WINGS VISUALLY INSPECTED, NO DEFECTS. AILERONS & TRIMS VISUALLY INSPECTED. ACFT TEST FLT UNSATISFACTORY. ACFT ROLLS ABNORM LT PASSING THRU 10 DEG LT BANK. ACFT ROLLS RT NORM. MX CHECKED AILERON CABLE TENSION IN WINGS AND LT & RT AILERON BALANCE. REPLACED LT AILERON & SERVO. TEST FLT SATISFACTORY.