Are the wires shorted internally, or are they rubbing where they exit the motor can? If they are rubbing where they exit the can maybe you can fit a grommet in there to keep them from shorting anymore. Even a piece of balsa wood would work. It might be a temporary fix but it should make the motor usable until you can buy a replacement.
Definitely sounds like a short in the motor. Do not open the motor though. Send it directly to NeuMotors. Here is their repair information. repairs@neutronics.com
They can let you know an exact price, and all other pertinent information on getting it repaired.