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This might be from the roof vent or from a plumbing line near the fridge, if you are sure that it isn't draining out of the fridge. That drain line needs to either have a drain cup or be directed outside the vent so it doesn't collect in the floor area where the fridge sits. Check those things and then get back to me if you need help on the repairs. I will make a phone chat option available for you as well. All follow up are included in our fee.
Just checking back in to see if you were able to sort this out or do you need some additional input from me?