Do not over tighten those ac bolts. They just need s little tension on them. That it. Tighten them up tight, and you'll be replacing the foam seal.
As for cleaning the filter. It partially depends on your environment. I tend to clean mine about every 6 to 7 days of usage.
As for roof sealing. Twice a year, I wash the roof, and inspect the caulking. That's it.
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