I was flying with a friend today and his 7c's right stick aileron input quit working properly. Is there an easy fix I can do here for it? Anything to look for?

It still sends a signal to move the servo a bit but not fully. It just more or less twitches when you apply aileron input. I have had my 7c's since their release and have never had anything like this happen. Any way of avoiding the send in process? He would like to fly this weekend in a club fly.

Kevin