I presume you have power to one side of the solenoid. If true, Take a multi meter and check the controller, you should have no continuity with the switch centered, zero or close Ohms with switch engaged. If it doesn't go to zero ohms when you trigger the switch then that is your issue. If the switch is working then jump the solenoid. If the winch powers out it is clearly the solenoid. If it doesn't power out it is in the connections inside the winch motor.
Best of luck and let us know what you find please.
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