I feel like I hit the motherload finding you!!! I wondered what the condensation marks meant, now I know. I have noticed in other repairs that many times they have over tightened and broken screw heads on the original install. When I go to remove the main brackets if any are broken, what is best practice for drilling them out? I know I will only have one shot at it. It is one of the reasons I want to wait until spring/summer when the weather is better since I don't have a garage to work in and I want to take my time... I know the wall of the aluminum channel is not that thick
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