The vent for the rear of your refrigerator has a water line feeding your ice maker that will freeze up in cold weather and needs to be drained before cold weather. Right now I would say the small water line that feeds from your water connection under kitchen sink may have a shut off for that water line that if it was closed you would not have had the flood. The line is ruptured or broken off inlet to ice maker that now needs to be fixed.
This link will have many answers for you including things to be winterized so you can still use coach in winter camping.
With your water line connected you will be pushing water out of that broken line without running the pump.
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