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Gibson is not a name that has been in use recently. I'm guessing that the freezer may be older than 12 years. So, normally with the energy savings that you would get with a new model it probably is not work the effort to repair this unit. New units will save enough electricity for you to see a difference in the first bill.
If you are handy and would like to more information, please send me the model number and we can start from there.