I took the top part off and here are the pics of the interior. When I turned on the power and hit the engine icon the gun barrel assembly started moving up and down continuously again, I disconnected the 2 wiring harness going from the brain to the top portion and then re-installed them, but it still does the same thing. What is the receiver and where is it on the tank? I guess the "Multi Function Unit" is the brain (is that the RX-18)? It looks like all the wiring harnesses can be disconnected from the brain, is it a matter of just ordering a new brain and re-installing the wiring harnesses.
So is it the