Adjusting the trim, gain, and tail compensation dial doesn't seem to have any effect. The tail rotor starts spinning as soon as I connect the batters and the 4-in-1 receiver. The led on the receiver just blinks red at me while the tail rotor spins away full throttle. It also does not seem to be accepting any signal from the remote while doing this either. If I unplug the tail motor all other components work properly. I'm afraid the 4-in-1 receiver might be damaged, E-Flite claims to test them all first so you think they would have caught that if it was the case.