I cannot find info on this unit but it sounds like a drain tube problem re: water from defrost.

Check that water is running into the fresh food section and then out onto the floor.
If yes then it is probably a plugged drain tube.

If not then check the drip tray under the unit. it may have a crack etc.
if it is overflowing then check that it is clean and that the coils/fan etc under there are clean. Could be that air flow is poor so the water is not evaporating.

Drain Tube

Remove the cover in the freezer so you can get at the drain tube. It will be under the evaporator coils.
Note that some units drain into a funnel like part at the top, back of the fresh food section and then out the back and down to the drip tray.
I would check that it is clear.
If plugged a turkey baster with warm water, an air compressor with low pressure or a wire can often be used to clear it.

Also check that it is not plugged with dust etc. at the drain pan end.
You might as well clean the condenser/compressor fan and the condenser coils while you are down there.

If it looks like stuff is growing in the tube I would flush it with a 10% bleach solution. This should kill the stuff and let you flush it out. You may have to do this several times, let it sit for 15 minutes or so between flushes.

Be careful that the drip tray does not overflow and empty the drip tray after you are done.

Be sure to unplug the unit while doing this.