What was found
FLIGHT 7702 DEN TO YYZ ON DESCENT THE AUTO PILOT KICKED OFF AND THE AIRCRAFT WAS HARD TO TURN. THE AILERONS FELT AS IF THEY WERE STUCK AND WERE GETTING PROGRESSIVELY WORSE. PILOT DECLARED AND EMERGENCY AND LANDED WITHOUT INCIDENT. MAINTENANCE LOCATED A POTABLE WATER LEAK WHICH FILLED THE BELLY OF THE AIRCRAFT WITH ICE CAUSING BINDING OF THE AILERON CONTROL CABLES. ON-CALL MAINTENANCE THAWED THE ICE, DRAINED THE WATER AND REPLACED CRACKED POTABLE WATER T-FITTING.