This may cause short circuits, which can cause a fire. First of all, you need to get rid of all the squirrels that are chewing the wood to get in your attic. I'm assuming you got rid of the squirrel you caught by killing him or turning him loose miles from your home. If you turned him loose a few blocks away, he probably came back. The same squirrel may be doing all the gnawing.
Traps work well when baited with peanut butter spread on bread crusts or apple slices.
After you've caught one squirrel, set the trap again to catch another. Keep the trap in place for at least a week after you catch your last squirrel. You want to catch all the squirrels before you spend time and money having the wood fixed. It may give you piece of mind to know that a professional is handling the problem for you. Because peach trees bear fruit on wood that grew the previous year, the pruning system best suited to keep the fruit-bearing surface close to the ground is the open vase center.