What was found
(CAN) ON FINAL APPROACH FOR LANDING, CAPTAIN REPORTED THAT HIS YOKE STUCK AT ABOUT MID-TRAVEL & WAS UNABLE TO MOVE IT IN BOTH DIRECTIONS. CAPTAIN TRIED TO YANK YOKE BACK IN ATTEMPT TO FREE IT, PROCESS THE STICK SHAKER CAME ON. THE CREW FINALLY SUCCEEDED TO LAND AIRCRFAT WITHOUT INCIDENT. WITH A/C ON GROUND, EXTENSIVE TROUBLESHOOTING CARRIED OUT ON ELEVATOR SYSTEM. MAINT UNABLE TO DUPLICATE YOKE BEING STUCK AT ANY POSSITION.