How do I replace the defrost thermostat in an Amana refrigerator?

I have an Amana top freezer refrigerator, model TJ22KW that has stopped defrosting. I have done extensive testing and determined that the defrost thermostat is defective. It heats for about 1 or 2 minutes on each cycle and then cuts off.
My question is how do I remove the evaporator cover to get to the thermostat? Does the plastic around the doors just snap out? Do I need any special tools? Do I go in through the bottom of the freezer or the top of the refrigerator?
Any help will be appreciated.
G.M. Durrence (to reply remove -nospam from address)
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G. M. Durrence wrote:

Hi,
Amana also uses "P" or "Man" #'s with the model#.

Remove power! The back wall inside the freezer should have screws, remove these and the back wall will tilt out towards you to access the defrost thermostat.
http://www.repairclinic.com/referral.asp?R 3&N6461 Defrost thermostat - shows on back order :(
jeff. Appliance Repair Aid http://www.applianceaid.com /
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first, what "extensive testing" did you do? How do you know this about one to two minutes?
I really wonder about your diagnosis. I've replaced those thermostats, but would like to know how you got to that point of view.
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Christopher A. Young
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