You may want to have this checked out by an authorized servicer. Usually this means the insulation is getting old and that isn't a problem that can be fixed, which would spell out a new fridge. Definitely worth the checkout fee to make sure there isn't something else causing it that can be repaired. They stopped making the 550's in about 1997 and started them in about 1986 so depending on the age it could just be tired.
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You may want to have this checked out by an authorized servicer. Usually this means the insulation is getting old and that isn't a problem that can be fixed, which would spell out a new fridge. Definitely worth the checkout fee to make sure there isn't something else causing it that can be repaired. They stopped making the 550's in about 1997 and started them in about 1986 so depending on the age it could just be tired.