Ok, so it's sort of a long story, but here goes nothing. I started a project to turn my MR-01 into a MR-02, basically just by switching the electronics board out with the new chassis, new motor mount etc. Everything fit together fine, and i made sure to keep everything intact and in the same order it was in on the MR-01, but when I put batteries in it and turned it on to test it, the soldering on the wires melted and they came loose. At first I freaked out because I thought I had fried the whole thing when I saw little puffs of smoke coming out from it, but further inspection showed that only the battery wires and the servo motor wires had come loose.
So I'm assuming I reversed the battery wiring (Idiot, I know) and my question is this: Can I resolder the wires and fix it? or Is the circuitboard complete toast?
Another thing- I've looked into it, and a new circuitboard costs around 80 dollars. I could get a new mini-z off of ebay for less than that! whats the deal!?

you probably shorted the motor, hence the high temps and the desoldering of the wires. however, there is also a possibility that you did short your esc board. uninstall everything and solder the wires and what not back on and try running it, if it works, then good, if it doesnt... then smell the board for a burnt electronics smell. if that is present, you may need another esc board.
btw, why would you want an m01 board in a m02? the m02 board is better than the m01