WEST PALM BEACH, Fla. (AP) — The federal government said Monday that it has found a “strong association” between problematic Chinese drywall and corrosion of pipes and wires, a conclusion that supports complaints by thousands of homeowners over the last year.In its second report on the potentially defective building materials, the U.S. Consumer Product Safety Commission said its investigation also has found a “possible” link between health problems reported by homeowners and higher-than-normal levels of hydrogen sulfide gas emitted from the wallboard coupled with formaldehyde, which is commonly found in new houses.