What was found
ON CLIMB OUT, WE PASSED THROUGH 2 LAYERS OF CLOUDS. THE FIRST LAYER WAS FROM ABOUT 1500FT TO 5000FT. THE ANTI-ICE WAS TURNED ON BUT WE DID NOT GET AN, ICE DETECT, CAS. THE SECOND LAYER OF CLOUDS WERE FROM ABOUT 9000FT TO 10500FT. THE ANTI-ICE WAS AGAIN ON & WE DID GET A, ICE DETECT, CAS. AFTER THE CAS WENT OUT AROUND 15000FT, WE TURNED THE ANTI-ICE OFF & CONTINUED. AROUND 15000FT, THE AUTOPILOT WAS ENGAGED. HAD A COUPLE BRIEF LEVEL OFFS AT AROUND FL190 & FL210, GIVEN 10-15 DEGREES OFF COURSE FOR TRAFFIC, CLEARED TO FL250 & GIVEN DIRECT ON COURSE FIX. WHILE PASSING THROUGH FL220 & IN A 2 - 5 DEGREE BANK THE AP AIL MISS TRIM CAS APPEARED. IT WAS THE FIRST OFFICER'S LEG TO FLY, WE DECIDED TO DISENGAGE THE AUTOPILOT & HAVE HIM HAND FLY. UPON DISCONNECT OF THE AUTOPILOT, HIS CONTROLS HAD FREE ELEVATOR CONTROL BUT LITTLE TO NO AILERON CONTROL. COULD MOVE THE YOKE ONLY A VERY LITTLE & WHAT HE COULD WAS STIFF. DECIDED TO DISCONNECT THE AILERONS & HAND FLY FROM THE LT SEAT. RETURNED BACK WITHOUT ANY FURTHER INCIDENT.