The organization raising money to renovate the Illinois governor’s mansion says the most pressing need is replacing the ailing roof on the 160-year-old building.  In a news release, the Illinois Executive Mansion Association says it plans to release construction specifications to contractors interested in repairing the roof.  Leaks from the roof — which hasn’t been replaced in 45 years — already have caused water damage inside the mansion.  Jeff Evans is volunteering with the association and owns a Springfield architectural and construction management company.  He says it’s important to replace the roof “as soon as possible.”  Evans says: “We must make it watertight to combat future leaks and further interior damage.”  Governor Bruce Rauner has said all repairs will be paid for with private funds.