Hello! I am looking at purchasing my first pop up, and my family and I have found one that has all the features we are looking for. Only problem is that it seems to have a slight leak somewhere. The seller says that it leaks around the AC during heavy rain. The seller of course makes it seem like it is no big deal... How hard would it be to fix (for someone that is new to all this and is moderately handy) and is it worth looking at?