Hi, I'm not sure if this is the place to ask the question or get the answer. My sliding glass door attached to an upper deck leaks and water comes in on the bottom track. I need professional help to have this corrected. It has damaged my wood floors and the inside of the molding too. What should be done to correct the problem and who should I contact to get it started? Does this mean the door needs to be replaced, if not then what is the solution? Thanks for advice as to where to get help for this.

You're going to have to call a contractor. If you don't know one, ask at a home center (Home Depot, Lowes)

Sometimes if ice builds up under the threshold it will push it up and break the seal, which allows water to travel into the house. This might be what happened to you as well, try a window and door installer or a local carpenter.