Chevy,
Look where the wires go into the motor they tend to break there, right where they go from large wire to the smaller coil windings.

The motor windings are the large coils of wire inside the motor, look at the ends where the wires exits the coil.

Peel the wrapper on the ESC and check those wires also, check for bulging or burnt components on the board.

It's leaning toward a bad speed control.

Me being a Chevy man I used to knock Ford, not any more, when you can weather this economic storm without a bailout, you've earned my respect.