I've had my MCX for a few weeks now. It has survived several crashes but nothing major. Now I've noticed that it wants to fly backwards. Full forward on the stick makes it hover but not go forward. Also at times It doesn't want to respond when I apply left aileron. I took the body off and noticed the aileron servo moves up fine but doesn't always want to move down. Any ideas of how I can fix this? This is my first helicopter so I don't know too much about repairing them.

WEll lets see here from what I can tell
try trimming the remote before you plug the heli in
make sure that the trims are at zero longest beep on the remote
then plug the heli into the battery and see how it flies
mine needs trim before I even take off cause it wants to spin in circles so I have to trim to the right
If this does not work a new board may be necessary
I am sure others will have some advice

Either you have a damaged servo or a damaged swashplate. My MCX crashed once and now myelevator servo is jittery. It only stops when I apply down stick.....It fliesfine..... for now. But I know it will get worse; preparing to buy a new one........ You may have to buy a new part depending on which one is the problem.