Ahh, you released the magic smoke. Pretty much all you can do is move on and get new Vics. The 883 was the predecessor to the 884, and could only handle 30 amps (thus the 3). This is generally okay, but I'm guessing you hit a wall or turned real hard and drew a lot of power. In order to get a new 884, go to
www.ifirobotics.com. Hope this helped (i've done it before). We've taken a few apart, the X is always there. I think that it's just markings from the factory.