I decided to remove my upper kitchen cabinets to replace them with open shelving. I was able to remove all but three cabinets quite easily with very little damage to the (plaster) walls. The three cabinets above the stove are a different issue. I removed all of the screws as I had with the others but the outer cabinets will NOT come down! There is no evidence of any other attaching screws and the vent hood is only attached to the cabinet above it on the bottom of the cabinet. Help please!