That model number didn’t seem to be correct but I would say that the drain is stopped up. Remove the evaporator cover (cover off the back of the freezer) once off you should see evaporator coils. Under the coils you there should be a drain hole. If the drain is stopped up the drain will be covered with ice. Remove the ice and unstop the drain by forcing hot water down the drain with a turkey baser or any squirt bottle.

Note if your model had drain trap on the back that is probably where it is stopped up at and you can just unstop it there. So you won’t have to take the evaporator cover off just take the trap off and unstop it at the water hose.

In any case once the drain is unstopped mix baking soda with water then pour it down the drain to prevent the drain from stopping up again anytime soon.
Refrigerator Leaking Repair Guide