I have a brick accent wall (rectangle) in my kitchen. Crown molding borders it on all sides. The problem that I am having is that the crown molding is separating / splitting from the wall.
It looks like they placed a flat piece of crown molding / board / wood on the wall first and then secured the top (decorative piece) ontop of the flat piece. I dont see where screws / nails could have been used.

I need to know what is the best way to secure the top piece back to the bottom piece without taking it down and eliminate the gap it is making. I was unable to post pics.

If you would like to see I have pics available.

Thank you