How to fix bathroom wall coming apart.

Our bathroom wall is coming apart.

We have a 2005 2720sl and our walls are coming apart at the corner shelf area. The wall the door is attached to and the wall by the kitchen sink are pulling apart. You can seen the nails. My husband took a rubber mallet and put them back together, but they did not stay. We are considering using a strong wood glue and clamps to repair. HELP!

Can anyone suggest any better way/idea? Do I need to ask the TM factory?Thanks