How do you repair the firewall on a peterbilt?

To repair the firewall on a Peterbilt, first, assess the damage to identify whether it is a rust issue, a hole, or structural damage. If it's rust, clean the area thoroughly, apply rust inhibitor, and patch it with metal or fiberglass as needed. For holes, cut out the damaged section and weld in a new piece of metal. Ensure to seal any joints properly to maintain structural integrity and prevent future issues.