Found an 18inch return flex duct with exposed inner liner with holes, 14 inch return is collapsed and is torn, 1 8inch supply run has exposed insulation with a hole on the inner liner. Another 8 inch supply run is completely exposed for mice to get in. Snake skin is laying on top. Tech quoted out the repairs and also recommended to have a visit from our field supervisor to provide a solution. Customer declined repairs and visit for now and stated that he will attempt to repair it himself first.