Does anyone know of a place I can get a zipper replaced on a piece of luggage?

Has anyone had a problem with water leaking from under the kitchen island? Everything is dry inside the cabinet so none of the sink drain pipes are leaking. The only place it can be coming from is the stand pipe/drain pipe that runs through the bottom of the cabinet and into the main drain. Since we have never owned a home built on a slab I’ve never encountered a problem like this. Any suggestions before I cut a hole in the bottom of the cabinet to hopefully expose the connection....