Bought a new house and noticed discoloration near the top corners of the drywall (Where the drywall meets the window). I chipped away at the moldy drywall. Wondering what type of product I should use to seal between the window and the wood frame (Would some type of caulk be appropriate?) Also how should I replace the drywall? Would using hot mud to deep fill this area work?![enter image description here](https://i.stack.imgur.com/NbpTp.jpg)![enter image description here](https://i.stack.imgur.com/Mg1ll.jpg)![enter image description here](https://i.stack.imgur.com/ROWGF.jpg)![enter image description here](https://i.stack.imgur.com/XEL82.jpg)