3GX elevator axis issue

[fastone93]

I have two 450L dominators, one flies perfectly and the other one doesn't....

It is very darty in the elevator axis, I have tried increasing and decreasing the elevator gain, but that only makes it worse.... I can put it in straight and level flight and release the controls and it will loose or gain 5 feet of altitude in the blink of any eye, uncommanded. normally it will loose altitude rather than gain it. The aileron and rudder seem to be just fine, only the elevator is jacked up.

Any ideas or advice?

Thanks,
Brian

[Stevendavis]

Pop off yor swash controle links and see if your swash moves freely. residue can build up on the main shaft and cause some binding issues on the swash. Also make sure your servos are working properly.