Refrigerator was working fine. Opened the door found no light on & temps warm. Checked wall Plug, no power. Moved plug to outlet of GFI. Tripped GFI immediately. Tried several times with same results?.

I would try plugging it into a standard receptacle.
It will then trip the electrical box breaker if it is a dead short in the unit.
Be sure that it is a properly grounded receptacle.

If it does not trip the breaker then:

:It could be a bad ground fault receptacle.
:Could be a problem (moisture) in the evaporator area. Try rotating the defrost timer in case the unit is in a defrost cycle and this is blowing the GFI. I think the timer is behind the kick plate at the front.
I am not sure of this as the parts breakdown at the Sears parts site seems to have problems showing the breakdown for this unit.

I do not know if you understand the difference between a circuit breaker and a GFI so I will try to explain as it may help you troubleshoot this.

A standard circuit breaker monitors the current going into an appliance. If the current exceeds the breaker's rating it trips. A dead short will do this.

Basically GFI monitors the current going into the appliance and the current going out on the Neutral wire. If these two do not match it trips. The current has to go somewhere so it must be going out the ground wire. This can be a few milli-amps. (a partial short).
Sometimes moisture can get into the defrost component plugs etc. This then a current path for electricity to the frame and will cause the GFI to trip.
This is just one cause, there are many more.