Site survey - the top window is where the leak is

Top edge of the window before I got started

Top edge of the window before I got started

The area where water has been seen, after dousing the window with 5 gallons of water

Comparing the top edge of the second floor window that doesn't leak

Comparing the top edge of the second floor window that doesn't leak

Added sealant along the bottom of the window

Added some sealant along the bottom of the window