I have a 2003 PT-175 and the very left rear corner of the back casting deck is creaking and I can't figure out how I can get to it to see what's causing it. It is directly behind the small storage compartment on the left that is foam filled behind the passenger's seat. It appears that the carpet is glued down on that part of the deck and not wrapped around a deck board. It is right beside where the batteries are but you can't access it from there either as there is an aluminum divider there that separates the compartments. Anyone have any ideas what's causing the creaking noise when you step on it and how I might fix it? Thanks.