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Hi, welcome to Just Answer. My name is ***** ***** I look forward to helping you! I suspect you may be seeing condensation from the heat exchanger that runs up the lack of the refrigerator on the left side (facing from the front). If you remove the rear wall from inside the freezer, right where the copper lines come in and meet with the aluminum lines to the evaporator coil, is there green stuff on those4 lines, especially up into the foam sleeve as it goes out the back of the cabinet?
The heat exchanger tends to sweat and then drips down onto the floor in the back. The insulation breaks down where the access panel covers it and the moisture finds its way down the back to the floor. The refrigerator is on rollers, you may need to raise the leveler legs so it allows movement.
It is a bit wobbly, so you will definitely want to make sure you don't allow it to tip forward on you. They are top heavy and narrow front to back. There should be a drain pun underneath, yes. Is there no pan at all? If not, that is probably the issue, not the heat exchanger. Wide temp swings could be from too little product, sure. Also, if the return air vent, located toward the bottom on the left inside the refrigerator, is plugged it can cause temperature issues.
The model tag should be in the freezer on the side wall, usually about waist level. That is actually made by Kitchen Aid, so you should find the tag there. Viking only makes their ranges, the rest are sourced, branded with the Viking name and the price doubled.