A quick google search lead me to the problem - the plastic door gasket had become loose and broken. Received the part very quickly and installed it that night after a little trial and error. What the videos don't tell you is that to properly 'seat' the gasket you need to angle it UP when you push it into the little gap. If you angle it up, it will catch and seat properly, if you just push it in normally, it won't catch on the right part and it'll just hang loose at the bottom of the door and fall right back out.