I also have a 2006 3400, and each drawer has a separate latch. The same type of friction latch that is used on the mirror closet door as soon as you walk in on the right. Each of my drawers has the male part of the latch mounted on the lower inside face of the drawer, and the female spring loaded part of the latch is mounted on the cabinet stile. It takes a good pull to get them open. Maybe you have them and they are not aligned?