Yes, I had a rcboat I sunk water got in the radio box, the servos and reciever got wet. I opened up everything and dried it out.
I had the same kind of problem after that, my throttle worked great but my rudder would stay cocked to the right. The servo was ok the reciever was the problem
If you have already changed the servo and still have the same problem with the new servo, take your reciever down to a hobby store
I'm sure they will help you test it.... then try to sell you a new 1
