Mine did that too. I used a sharp hobby knife to cut alot of the bottom off the case. Then the wires and board are covered in a tough epoxy or something which you very carefully have to cut and peel enough to expose the wires. Bare the wires and solder the wires back on with not to hot of an iron using a pencil tip. I covered everything back up in shoo goo, plus some of the wire leads a bit away from the case so hopefully it doesn't happen again.
Have to be very careful and patient, it was almost not do-able.
Team Associated & CRC, Trackstar motors/esc's, Spektrum radios.
Keeping racing fun and affordable with my 7 year olds :)
The best track I've raced is the one in my backyard!