Remove the motor brushes and check to see if it is worn. Check for voltage on the brush holder tube. If you have no voltages trace the wires from the electric source and switch. If you have voltage it is your brushes or armature coils. You can purchase parts from the below link.
http://www.ereplacementparts.com/milwaukee-907520-ser-239a-impact-wrench-parts-c-131_5120_5406.html
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