Hi RLR
I just removed, reworked, and re-installed mine this past June, on our 1990 H-33.5. Ours did not have a fixed port in it - just a line cover. I'm not sure of it's formal name, I just called the "Line Cover", since it covers the control lines from the mast area.
Remove all of the screws on the top and on the sides, then have 2 or 3 sturdy putty knives/scrappers on hand. Place the scrapper under the calking and work it in. Place another to it's side and work it in also. Just keep working and prying gently and you will eventually free it and be able to lift it off. Under the inline row of screws on the top (2 lines of screws), there are rectangular pieces of hard wood that the cover was screwed into.. Those blocks of wood were also screwed into the deck. I found that the 2 wood blocks had NEVER been coated by Hunter before they were installed, and water got to them and leached out.brown goo on to the deck and it ran out. The blocks were in generally good condition. I dried them in the sun and then again in a low temp oven at home. (The Admiral wondered what the hell I was doing to her oven). I then coated them with 2 coats of West System Epoxy. I the re-installed them on the deck after thoroughly washing the exposed deck. We put about 2 kits of Marine Tex White on the rough underside of the line cover to fill in multiple small voids/holes and let that cure overnight. We then re-installed the line cover and all of the stainless screws. In doing that I dipped each screw into a tube of BoatLife Life Seal to coat the screw threads and then screwed the screw in place. I put some life Seal on the top of each screw head. I then re-calked all around the edges with Life seal - actually I placed long beads of life seal in the deck grooves before setting the lime cover in place, then re-calked the edges after it was screwed in place. It came out well. The Admiral and I did it together at age 74 & 77. So it is a manageable job. Just have patience with the removal of the line cover.