I have a 1980 T-33, #60 and I replaced the ports and cabin liner 3 years ago. Beckson still makes the ports and has very good installation instructions. My teak liner was delaminated and had to be replaced. It is epoxied to the deck mold so it must be overlaid. You must trim the headliner battens and remove the bottom rail and grab rails. I used White FRP panels and it lightened up the entire boat. The real chore is to remove all the old silicone sealant. Yes, every speck. Silicone will not stick to itself. I finally found a silicone remover at the hardware store and it worked like a charm. The T-33 is built like a rock, but after 28 years, the original sealant has reached it's limit and will need replacement, as evidenced by your leaking ports. You can plan to remove everything from the deck and re-bedding it in the next few years.