Dh was making a racket in the attic at 7:30 this morning. He had gone up to inspect the duct work. A squirrel made a hole in it, so he taped it. In the meantime, he discovered that one of the beams up there was broken. That's what all the racket was about. He reinforced it. The next time he's got a day off work, he'll get some angle iron, and further reinforce it, but what he's done will do fine for now.
BTW, plugging the hole has made a very noticeable difference in our AC today. It helps when part of your cold air is not leaking out into the attic.