What was found
AT CRUISE ALTITUDE AILERONS WOULD NOT RESPOND, PILOT HAD TO PULL AILERON ROLL DISCONNECT FOUND THAT THE LT WOULD RESPOND AND RT STILL HAD NO RESPONSE PILOT DECLARED EMERGENCY AND ASK FOR A NEW DESTINATION TO KGJT UPON SHORT FINAL INTO KGJT PILOT REPORTED REGAINING CONTROL OF RT AILERON. PILOT REPORTED HEAVY RAIN AND WEATHER AT DEPARTURE. MET AIRCRAFT ON LANDING TO INSPECT AILERONS FOUND MOISTURE BETWEEN AILERONS AND SEALS FREEZING AT ALTITUDE PREVENTING RT AILERON FROM MOVING FREELY IN FLIGHT. DRIED ALL MOISTURE FROM UNDER SEAL AREA, CLEANED WING SEALS, INSPECTED FOR DAMAGE NONE NOTED AT THIS TIME. PERFORMED AILERON RECONNECT PROCEDURES AND OPERATED AILERONS WITH AUX PUMP THROUGH SEVERAL CYCLES NO DEFECTS NOTED IAW MAINTENANCE MANUAL CHAPTER 27-10-00 AILERON AND TAB ADJUSTMENT/TEST. OPERATIONAL CHECK GOOD. DETERMINED ROOT CAUSE TO BE MOISTURE BETWEEN AILERON AND SEALS FREEZING AT ALTITUDE AND PREVENTING RT AILERON FROM MOVING FREELY IN FLIGHT.