my jr xs3 is acting wierd all of a sudden. the thottle trim switch wont go back to zero. it only goes up. this just happened today. it clicks and makes the sound it's suppose to when you bring the throttle trim back to zero, but no go. anyone know how to work on these things? i'd be willing to throw it in on a trade for a radio that works. i dont need crystals or receiver. just the 75mhz fm radio. any model i will take into consideration.