Open the fridge and at the rear is the drip pan for the fridge when it defrosts. Check to see if that pan contains any water. It's easily removed and cleaned if necessary. Attached to that pan may be the hose in question. On the 1200LRIM that hose ran to a separate pan in the fridge compartment accessed thru the outside panel, but on yours it most likely simply drains under the coach.
HERE is a pretty good video of it if you're not familiar with it.
If yours is like the one in the video, (cleaner I hope :) ) then I'd check to ensure your fridge is defrosting properly. I'd also make sure the drain pans are clean and no debris accumulated in the drain lines. Sometimes when the drain is clogged, the defrosted water accumulates in that pan then drains out. Most likely you've either never noticed it before or because it is designed to empty slowly you've not seen it. But, if that pan fills up and empties at once you'll see more water drain out....Dennis