I was setting the control throws on my Cap arf when I noticed that the elevator acts funny: I have it in neutral, pull stick to take it up and then when I let the stick go to return to neutral, elevator ends about 3/4 of an inch from neutral. Only way to return to the neutral point is push the stick to go down then when I let stick go all is ok, elevator goes to the right point. Is this a servo problem? All the linkages are good and not bending. Thanks!