What was found
CLT - FLT 572 - APPROACH TO CLT,'B' A/P ON, A/C MADE UNCOMMANDED 30 DEGREE ROLL TO THE RT. AFTER A 20 DEGREE HEADING CHANGE (30 DEGREE AOB SELECTED ON TURN KNOB), A/P CORRECTED TO HEADING SELECTED. NO DEFLECTION WAS NOTED ON RUDDER PEDALS. AFTER CORRECTION TO HEADING, A/P FLEW A/C NORMALLY. THRUST WAS SYMMETRIC. THE SPEEDBRAKE HANDLE MUST BE PULLED BACK MORE THAN USUAL TO GET THE SPEEDBRAKE ARMED. IT WAS IN THE ARMED POSITION DURING THE ROLL. NO DEFLECTION WAS ON THE YAW DAMPER DURING THE ROLL AND THE CONTROL COLUMN DID NOT MOVE UNTIL THE A/P CORRECTED BACK TO THE SELECTED HEADING. IT THEN DEFLECTED LEFT TO GET BACK ON HEADING. LANDED WITHOUT INCIDENT. REPLACED 'B' FLIGHT CONTROL COMPUTER (P/N 4051600-