Found 2 12 inch branch lines destroyed, 18 inch return flex duct is present. While tech was in the crawl space, tech noticed the duct work moving and the plastic making noise, tech believes that there may be an animal still present in the crawlspace and recommended to have the crawlspace looked at prior to making an decision regarding the duct work repairs vs full replacement. Due to high repair bills, field supervisor will be notified to provide a solution. Customer is interested in monthly payments option. System does operate. Tech spoke with our office regarding the ESA agreement/billing. Call customer prior to having our field supervisor dispatched.