What was found
CAPTAIN SIDE AUTOPILOT DISENGAGE BUTTON ON YOKE DID NOT DISENGAGE THE AUTOPILOT ON APPROACH. AURAL WARNING FOR DISENGAGEMENT OF AUTOPILOT WAS AUDIBLE, BUT HAD TO GET THE YOKE UNSTUCK. FLIGHT 3294-FILED CLOSED. TROUBLESHOT PER CRJ700FIM 27-32-00-810-801 "ELEVATOR STIFF/HEAVY". REMOVED AND REPLACED ELEVATOR SERVO ACTUATOR WITH SERVICEABLE UNIT, IAW CRJ700AMM 24-11-24. ALL OPERATIONAL CHECKS GOOD. PERFORMED OPERATIONAL CHECK OF AUTOPILOT SYSTEM, IN REF TO CRJ700AMM 22-11-07. ALL OPERATIONAL CHECKS GOOD. PERFORMED OPERATIONAL CHECKS OF AUTOPILOT CONTROL WHEEL DISCONNECT SWITCHES, IN REF TO CRJ700AMM 22-11-00. ALL OPERATIONAL CHECKS GOOD. CAT II RETURN TO SERVICE TASK CARD HAS BEEN LOGGED. TORQUE WRENCH SN 0716807133 CAL DUE DATE 03/21. PLEASE REFERENCE AML 563141.