Hatch (and port) leaks
are pretty simple, when it comes down to it. Just determine if the rubber gasket that makes the seal between the movable part and the frame is leaking, or if the area that the frame touches the hull
is leaking. Unless you broke the plastic (or metal), there really aren't any other possibilities.
If the gasket is leaking, try re-setting it, or ordering a new one and setting that one in place. If the frame-to-hull connection is leaking, there is no other choice but to take out every screw, take off the entire hatch/port, clean both contact surfaces perfectly, and re-bed using silicone! (My personal preference, and the only bedding material that doesn't voide the warranty of my own ports) It flexes like crazy and creats quite a seal.
Once you've done this repair once, you'll be very comfortable doing it again, as all boats require this type of maintenance
over the years.