Squirrels are incredible burglars. I have never experienced this, but once a squirrel learns a particular place and tricks, they will return repeatedly.
As an example, my next door neighbor has 2 vehicles. This last winter, a squirrel decided he liked to eat the wiring, the battery case!!, and various other underhood plastics. He didn't touch the other vehicle (both from the same manufacturer). he also didn't touch the insurance rental vehicle (also same manufacturer and model). After several months in the shop, they got their van back. Inside of a week, the squirrel attacked the same vehicle again!!! Both claims were $5000 - $6000.
I loaned him my live traps, and he is methodically removing all the squirrels in the area. I thought a pellet gun would be a better solution.
Anyway, screens are easy to replace and material can be had at any hardware store.
"If the women don't find you handsome, they should at least find you handy." - Red Green