Most windlass switches are foot switches. you use your toe to control the windlass while you tail the rode with your hands. Getting access to the back of the switch to remove it is needed as it is a weather proof type switch. I'm not thinking this would be a incredibly complicated job but the switch may be a bit pricy.
Also, the switch only controls the high current solenoid that actually supplies current to the windlass so there may be issues with that. If the switch is ok but the solenoid is bad the symptoms are the same.
Course this could be seller code for the windless does not work too. Press the foot switch and nothing may be the switch, may be something much more expensive like the windless itself.
All said, replacing parts is not that bad but you will want to use that as a bargaining chip