The following link explains step-by-step how to access the lid and replace it:
http://www.fixya.com/support/r3557193-replacing_a_lid_switch
You do not necessarily have to disassemble the entire washer, but you DO need to release the clips that hold the washer casing to the back panel and frame so you can lift the case up enough to access the lid switch. The switch is mounted to the underside of the washer top panel. With the washer case installed, it can be difficult (if not impossible) to access the switch through the wash tub opening. The process is much easier than it sounds and will offer you the best access. Removing the washer case will also offer the quickest method of installation.
If you have not purchased a replacement switch, yet, you can purchase them from any of the following websites:
searspartsdirect.com
pcappliancerepair.com
appliancepartspros.com
repairclinic.com
Prices vary between sites, so shop and compare. the first three sites listed also have helpful exploded view parts illustrations to assist you with locating and properly identifying the parts you may need. If you do not wish to order on line, this is a common part that any appliance parts retailer should carry as part of their in-store inventory. The part number for the model number you provided is 3949238.
If you have any questions, please post back and let me know. I hope this helps you.
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