What was found
AIL TRIM LIGHT ILLUM DURING CRUISE FLIGHT. PILOT ATTEMPTED TO FREE FROZEN CONTROLS BY SLAMMING CONTROL WHEEL TO LEFT. CONTROLS WERE FREE BUT BINDING. CONTROLS FROZE WHEN PIC SLAMMED CONTROL WHEEL LEFT, CONTROL WHEEL STUCK IN LEFT POSITION. CAUSING AN CONTINUOUS TURN OF A/C. DIVERTED TO ENROUTE AIRPORT. AT LOW ALTITUDE CONTROLS WARMED UP AND AILERONS WERE RELEASED. MECHANIC LOOKED AT A/C AND NO PROBLEM NOTED WITH CONTROLS. TRIP WAS CONTINUED WITH NO PROBLEMS. UPON RETURN TO HOME BASE A/C WAS REINSPECTED. A CRACKED DRAIN FITTING IN THE GALLEY WAS ALLOWING WATER FROM ICE BIN DRAIN TO LEAK INTO AP SERVO AND FREEZE. FITTING WAS REPLACED. NO PROBLEMS NOTED SINCE FITTING REPLACED.