My parent's house has had a leaking window frame for the last few years. I think that the water comes in from outside the frame.
How can I prevent further water infiltration and seal up the interior?
I've done some drywall repair projects before, should I just use my putty knife to scrape off the existing drywall and put on a new coat of drywall mud?
Or should I cut off the drywall and buy a new piece of drywall and screw/nail that in place and joint the edges?