Greetings. I am new here. I purchased a home 2 years ago, and we have noticed moisture getting into our back sliding glass door. Recently, the base panel actually popped off, exposing swollen and rotting wood inside the door. (pics attached) Eventually, I plan to replace this with French doors, but at this time, I want to repair it enough to get through the winter. I am unsure how to proceed. Do I cut and chisel out the wood, and replace it with a new board (may have to plane to fit). I would use pressure treated and also seal it. Or, do I use some other material to replace the old wood. Then, any idea how I seal it so we no longer have moisture intrusion? Just silicone caulk around the outer panel?The house does not currently have gutters. Thanks in advance!!!