Re: Gear Oil Hose Connection
I would bet that the hose is not diconnected, but the fitting that goes through the transom has the hose barb broken off. It's plastic and a complete piece of junk. The only thing to do is replace the fitting. There is a quick disconnect fitting on the inside that removes the hose from the reservoir, than an E ring holding the bulkhead fitting in. A real pain to get to, but it can be done.
On the outside, you will need to pull the outdrive. (Get used to it, it better be a yearly thing for other reasons) and pull the bellhousing to access the fitting and the hose.
Go up to the adults only sticky and downlod the OEM service manual #14 for more details. The parts are inexpensive (Cheap, that is why they break) to replace but a real PITA to do.