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So this could be just poor manufacturing of possibly there is a chemical on the door de-oxidizing the stainless steel. You'll want to wipe down the unit with white vinegar and then let it dry. Use Stainless Steel Magic to re oxidize the stainless steel and if that doesn't work the only option would be to replace the entire door to resolve the issue I'm sorry to say.
Hello again. I'm just following up because I haven't heard back from you and I see this question is still open. Is there anything else I can help you with?