I have two Velux I belive curb mounted skylights. Interior sash plat reads FS62 3075 N05A. I has been raining for days here in Colorado. One of the windows has developed a leak in the top left corner. What to do: 1. Can I fix this myself? 2. I'm hoping it is just a seal that needs to be replaced? 3. Should I contact a professional? 4. Should contact Velux?