What was found
(CAN) CREW REPORTED ON TAXI OUT WHEN THEY CHECKED THE FLIGHT CONTROLS THE ELEVATOR FELT VERY RESTRICTED IN DOWN TRAVEL MOTION. OPERATION FELT NORMAL WITH A SYSTEM HYDRAULIC DEPRESSURIZED. UPON INVESTIGATION FOUND A SYSTEM ELEVATOR PCU INPUT ROD TO ELEVATOR INPUT TORQUE TUBE ATTACH BOLT NOT INSTALLED. BOLT WAS REINSTALLED WITH NEW WASHER AND LOCKNUT. ELEVATOR SYSTEM FUNCTION CHECKED I.A.W. MAINTENANCE MANUAL 27-31-101. NOTE: BOLT WAS FOUND AT BOTTOM OF TAIL CONE. NO NUT OR WASHER WAS PRESENT.