Up on the roof for the 1st time today. Holy Moley! Flashed 1 side of the a/c & moved to the other. Realized why it leaks so badly. Previous owner flashed over rusty seams. Kind of scared about what I uncovered. Have to grind down the rust & see if there's any roof left. Looks like there's at least 1 if not 2 other spots like this. Grrrrr... Hopefully won't fall through.