The Emergency Rescue Boats Steering Motor for the Front Cannon is accessed under the top deck. To remove the Top Deck, start with removing the rear helipad deck cover, by pulling it up and away. Secured in four corners with pressure posts made to withstand your pulling it up and away. Or a flat screwdriver and slip it under the four corners and give it a twist until they are all loose, then pull it up and away. Now you have access to the 13 screws holding the upper deck to the hull. When removed, you can carefully lift the upper deck from the hull.
To remove the Steering Motors connection to the ESC/Receiver board, you must remove the two screws holding the ESC cover box from the upper deck. You will also have to carefully remove the Silicone Caulking/Glue from the hole in the ESC cover box and from the wires passing through that hole. Carefully scrape and pull the caulking away, until you can move the cover box out of the way, and unplug the Steering motor from the ESC/Receiver board. Then manipulate the wiring harnesses to get the correct one to the side with the larger hole in the cover box, and slide the harness connector out of the cover box.
To Remove the Steering Motor from its mount, you need to remove the two screws holding the gear/motor cover and lift it out of the way. With the cover off, just lift the motor out of its bracket.
Reverse this sequence to replace. Don't forget to caulk the hole in the cover box with a silicone caulking to seal it up.