Leak coming from my side by side fridge/freezer

YOUR DEFROST DRAIN IS CLOG UP YOU WILL NEED TO PULL THE BACK COVER OFF IN THE FREEZER SIDE AND CLEAN THE DRAIN YOU WILL SEE IT AT THE BOTTOM BEHIND THE FREEZER COVER

Sounds like a defrost problem, is there ice on the back wall of the freezer? If so the defrost system has failed. The most common repair is a Part# 67004757 defrost thermostat and adaptive defrost board Part# 67004704. Even with the parts in your hand, you will need to de-ice the freezer to replace the thermostat in the freezer section, then unplug unit to replace the adaptive defrost board located in the controls of the refrigerator section. Normally it can take about an hour to complete.
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check that your flapper on the ice shut through the freezer door is fully closed,
make sure there is no ice forming around your evaporator fan, thats the fan in the freezer, if that gets glogged with ice and is forced to stop, it could blow your entire machine control......
the frost in the freezer leads me to believe you may have a defrost issue

If everything else on the refrigerator seems fine (freezing and refrigerating are fine), then you probably have a problem with the drain hose under the evaporator coil. On frost free freezers, there is a heater that comes on periodically to melt off all the frost on the evaporator coil, and that defrosted frost (water) goes out a drain hose and collects in a pan at the back of the unit where it can evaporate.

Either the drain is clogged with ice inside the freezer, (in which case you might notice ice building up on the bottom of the freezer, or perhaps water collecting on the bottom of the refrigerator if your freezer is on top) OR there is something wrong with the pan at the back of the refrigerator, like a crack, or it somehow got tilted so that the water pours out. It is located behind the panel on the back.

Or perhaps, and this would really ****, the water line that supplies your ice maker is leaking, if you have one. If you do have one, I would recommend turning the water line to the fridge off before pulling the fridge out.

Unclogh the drain hole inside the freezer in the bottom of the bakc wall pouring hot water until the ice melted and keep pouring until goes through.Repet this every 3 or 4 months to keep it clear.

My Bosch Frost Free Fridge Freezer did the same thing - Ice forming in the bottom of the freezer area after a few days.

It was caused by a blocked drain pipe - When the freezer does the de-frosting cycle, the melted ice drips into a tray and tehn runs into a dish on top of teh compressor, through a pipe.

If this pipe gets blocked, the de frosted ice overflows from the tray and overflows into the bottom of the freezer and then re-freezes !

To fix, pull the freezer away form the wall, locate the pipe that runs to the dish on top of the compressor and blow through it - This should clear it. Alternatively, from inside the freezer compartment, pull off the cover at the back, but the clips holding it on will probably break off, as mine did ! You can sort of push the cover back on and re-fit the food draws.

it means that the freezer heater is bad, it's located after you remove the racks from the freezer and removing the back panel, it's at the bottom or below the condenser.

Check the ice maker. sometimes they get cracked a will leak water into the freezer compartment. Also check the ice maker fill tube for leaks or someone could have spilled something. Although this is tipical of a clogged drain. What happens is when the fridge go into derfost, it will melt all the frost that is on the evaporator, turning it into water. The water drains down to a trough under the evaporator and down a drain hole in the trough ( this trough is behind the evaporator cover ) Removing the melted frost from the freezer. If that drain is clogged, the water cannot leave the freezer. Then when the fridge starts back up ,it will freez the water that was not drained. After repeated defrosting the water will fill this trough and run off into the bottom of the freezer to be frozzen when the fridge starts to cool again.

The drain is plugged. This fridge will defrost every 8 hrs or so. When it does , it will melt the frost that has built up on the evaporator. This melted frost will run down a drain under the evaporator to a drain in the bottom directly under the evaporator. When the drain gets plugged the water cannot drain out of the freezer compartment. After several defrost cycles the melted frost will overflow onto the freezer floor. When the fridge starts back up it will freez this water is the bottom of the fridge. sometimes this water that is now ice will melt on the next defrost cycle and actually run out into the floor. You will have to unplug the fridge or turn it off, then remove the cover to the evaporator. Get a hair dryer and melt the ice aruond the evaporator and drain. Once the ice is removed, check the drain and try to clear it. Once clear, replace everything but the shelves. Plug the fridge back in or turn it back on. Observe and listen for the evaporator fan. It should be running now. When working on the ice on the evaporator always be carefull. The defrost heater can be damaged if up push or pull on it too much.

If the frozen side is colder than normal and some extra frost is forming where the fan blows,and there is ice in the bottom of freezer compartment, and the cool side is not cool enough, their is a good possability the defrosting unit is not removing all the frost and ice . the defrosting unit has a timer (usually near thermostat) that turns off the cooling fan and compressor and turns on a small heater around the evaporator ( about 20 minutes every 2 days) (evaporaror is cold heat exchanger coil inside the back wall behind a cover near the recirculating fan0, the fan circulates air to both compartments through two small openings, if these openeing are closed by ice buildup cool air can not circulate to the cool side. cure 1. remove all food and leave fridge off for 24 hours with doors open (take precautions to ensure children can't get locked in side and suffocate, if you get a qt of water in bottom of unit (may leak on floor) ice buildup that the defrost heater can not remove melted and was your problem . turn frig on replace food on unit. cure 2. turn frig off, remove food from both sides, remove shelves that block access to evaporator, remove cover over evaporator if you see the evaporator coils free of ice look at openings (2) to other side, one may be blocked with ice the other with frost, carefully melt ice with hair dryer.
If the evaporator coil is solid ice heater or timer or fan has failed. good luck