I have a 2009 Landmark Augusta. The vertical pantry cabinet that sits on the kitchen cabinet is loose in that it will tip slightly from the top when you pull to open the cabinet door. It is getting worse. Cabinet has a false back to allow for a vent pipe. I tried putting a screw through the crown moulding into the wall but there was nothing in the wall but foam insulation. Any suggestion on how to secure this pantry to the wall?