When our liner was replaced, our pool light was not reinstalled properly. The light quit working, and there was rust everywhere including the glass and the faceplate. We scrubbed and scrubbed, and it’s barely visible on the glass. Hubby has ordered a new light. My concern is the face plate that has rust on it. I’m assuming it’s plastic and it’s best to just buy a new one. We have a vinyl liner. Is it difficult to replace it? My husband’s concern is that that it’s holding the liner in place. Also, do we need to drop the water below the light to do it?