Check the deck core, and the wood board anchor points inside the cabin for water damage. Looking at a picture I grabbed off YouTube it appears fairly easy to replace the "mini bulkheads" that anchor the chainplates. But in reality they are like big backing plates so if the deck core is damaged you have a more serious job. Still a reasonable fix.. just a bit more technical. Tapping the deck and the little bulkheads with a small hammer or screwdriver handle should reveal whether the water has built up and caused some damage. A crisp sound is good, a dull thud triggers further inspection.. maybe drill a few pilot holes to check for wet wood. If the deck core has minor damage, I've had some success with penetrating epoxy, like "Capt Tolly's... Chances are, if you've noticed it fairly quickly, there won't be any damage at all and you can just reseal the area on deck under the cover plates.