In addition to walking around on the deck, take a screwdriver handle and tap around the deck fixtures to see if there are any dull sounds which could indicate water damage. Check the inside bulkhead along the sides and bottom for rot. Not a bid deal to repair just time consuming. The stantions I believe are not in a cored section of the deck so being loose will not cause a deck problem.
I would be most worried about the keel bolts, there are a couple of post showing nasty corrosion below the nuts. I would pull one nut and look to see if there is major damage to the bolt below the nut.