What was found
LGA-PBI - FLT 2693 - DURING A DESCENDING TURN THE CONTROL COLUMN SEIZED. NEITHER THE CAPT NOR THE F O COULD MOVE THE CONTROL COLUMN FOR SEVERAL SECONDS. AFTER A GO-AROUND THE AIRCRAFT LANDED W/O INCIDENT. MX REPLACED THE A/B AILERON PCUS, AUTOPILOT MODE CONTROL PANEL, YAW DAMP COUPLER, AILERON POSITION SENSOR. THE A/C WAS TEST FLOWN TO TPA WITH NO DIFFICULTIES. THE FOLLOWING WAS COMPLETED FOR ENGINEERING EVALUATION. A AND B HYD MODULES AND THE ROLL CHANNEL COMPUTER WERE REPLACED, AND FLUID SAMPLES WERE TAKEN FROM THE A AND B HYD SYSTEMS. A BENT PIN IN CONNECTOR D4462P WAS REPAIRED. AFTER RELEASE FOR SERVICE THE PROBLEM REPEATED AND THE AILERON CENTERING SPRING AND TRIM MECHANISM.