lrp k4 6.5t

[df-03]

I have a problem with the LRP VectorK4 6.5t , after test driving it is heated to approx. 60 degrees and minus wire is desolderd from the bullet connectors, the motor is no more spining unless take throttle stick and spin it with fingers, but even then does not reach full speed, I opened it and inside found two pieces of solder, closed it but still not working, i try another motor but esc work normaly, it is there way to fix it by myself or use waranty?