What was found
(CAN) ON CLIMB, CREW NOTICED THE ELEVATOR CONTROLS WERE JAMMED. ELEVATOR DISCONNECT DID NOT WORK. ELEVATOR JAMMED ON BOTH SIDES. FULL NOSE DOWN TRIM NECESSARY TO MAINTAIN LEVEL FLIGHT AT 160 KNOTS. AT 14,000 FEET, CREW ABLE TO MAINTAIN LEVEL FLIGHT. AIRCRAFT RETURNED USING TRIM. ABOUT ONE MINUTE AFTER LANDING, THE ELEVATOR CONTROLS WERE BACK TO NORMAL. WEATHER WAS PLUS 1 CELSIUS WITH MELTING SNOW AND RAIN. NO DEICING HAD BEEN APPLIED. FOLLOW-UP SDR INDICATED COMPLETE ELEVATOR SYST CHECKED AND ELEV SYSTEM CONSIDERED FULLY OPERATIONAL. SOME ROUGH PAINT ON ELEV LEADING EDGE. PAINT SANDED TO SMOOTH SURFACE AND ALL COMPANY AIRCRAFT CHECKED FOR SAME THING. CONCLUSION IS THAT ICE FORMED ON ELEV. PART TC: