Example model number: WTW5640XW

Here's part link to the replacement lid switch... http://www.repaircli...0404050/1938607

And here's how to replace it:

- Tape down the lid

- Remove the top screw from both hinged in back of the control panel.

- Slide the top panel forward about 1/2"

- Raise the front of the top panel up a bit

- While keeping the front lip lifted, push it back a bit

- Now tilt the top panel up on the rear hinges.

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Source: Whirlpool Washer WTW5640XW Lid Wont Unlock