You mean the box behind the passenger helm seat?
A few weeks ago I replaced all the drain hoses in my 215 DC. My arms were black and blue from armpit to wrist and most clamps were tightened by feel only. The boat certainly was not built with the thought of having to replace hoses in the future.
You should be able to get to it through the pie plate over the gas tank but it's gonna be tight.
Keep this in mind. The drain had to be accessed after the boat was decked to hook up the hose, either the deck side or the hull side. That being said, where is the access point? Inside the tub on the aft vertical face? And if you "know" that the hose came off, yet can't see it, how do you know?
Try this,pop that other plate and reach down with a camera with flash on and snap some picks,i did that when i rewired my fuel sending unit,had a wire hung up,same area as you just the other side of the boat and it helped alot.