hey i have a nikko sea star. i just got it used about a week ago. the steering servo works, but the submerge and propulsion motors are not working. i took the sub and transmitter apart and both look like new. no corrosion. i even supplied current directly to the motors, and nothing happened. neither motor is froze up. on the submerge motor i actually even put current directly to the brushes. i cant figure out the problem. do you have any ideas?

thanks