I have heard/read, more than once, of a chain plate modification and/or "U" bolt installation recommended for the C27. I have recently noticed evidence of leakage around my port chain plate. (I have the dinette layout.) I want to do a thorough job of checking out and making repair as necessary. How can I tell if the mod is already in place? If it is not, where do I get the required parts and what do I need to know before I start? Should I leave this job for the Marina service dept or is it something I can do myself? Should the mast come down or can it be done leaving it up? Any advice, recommendations, and /or suggestions, especially the “be sure you don’t” advice, would be greatly appreciated. Regards, Lysle