Remove wiring from the winch along with the four corroded bolts from the deck plate. Whiskey Tango Foxtrot, nothing happens! Use a hammer and other nearby objects to encourage separation activities to commence soonest. Again nothing happens. Cogitate on a possible plan B.
The deck plate is really stuck. Squirt penetrating oil twice daily on every conceivable interface. On day three beat on the parts mercilessly. The deck plate still won't freaking budge.