It's been my experience that those cabinets are installed at the factory so they can't be removed intact. I looked at the pic and see some ceiling damage outside of the cabinet, is there similar damage inside as well? In instances like this, I use a utility knife to cut the damaged piece out, locating studs first, and trimming back to the nearest stud, and cut a piece of luan plywood to fit the hole. after you cut away the bad spot, you take out the old, usually wet insulation, find and repair the leak, and insert and fasten the piece of luan. depending on the finish you have now, it is sometimes tricky to match it exactly, I've been told you sometimes can order replacement sheets from the manufacturer, but hear they are very pricey.....hope this helped