I am back in Utah but our boat (Liahona) is at the Woods Marina in Sea Cow Bay, Tortola (about 2 miles south of Road Town along the south eastern coast of Tortola). We will be back down there in March. It is the next bay north of Nanny Cay. We had been on the hard at Nanny Cay for the hurricane season but they didn't have any slips available for us upon launching. Jim Woods is an exceptional marina manager and very accomadating and it was signifcantly cheaper than Nanny Cay to boot.
I have the fresh air ventilation system but I do not have the diesel heater.
What do you need to check on the rudder screws that you mentioned?