Looks like you are missing the first 3 digits of the model number.

Some units have the drain tube connected to the drain pan under the evaporator coils in the freezer.
Some units with the feezer at the top drain into a funnel on the ceiling of the fresh food section and then out the drain tube.

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 tral after you are done.

Be sure to unplug the unit while doing this.