Willie, if you carefully examine the plastic plug that has the wires
     going into it you'll notice that the crimped on metal connectors are
     simply pushed into the connector and retained by a little barb on the
     crimped on metal connector.  If you push on the wire to free the barb
     then depress it against the metal connector with a toothpick, tiny
     screwdriver, or similar stiff, small crossection tool you can slip the
     connector out of the block.

     Label 'em first so you can re-fit into the new block.

     al