These cars were to be rehabilitated starting 2014 onward based on design specifications that were partially drafted in 2010; however, WMATA indicated in subsequent budgets that it wished to replace these rail cars with an additional 100 7000-series cars instead of overhauling them. This resulted in an increase of new cars being delivered. According to an April 2013 "Washington Post" news story, the transit agency said that it would forgo updating the 4000-series rail cars, and Metro had exercised an option with Kawasaki to purchase an additional one hundred 7000-series cars to replace its 4000-series cars, costing an additional $215 million under the contract. In June 2015 Metro pulled all 4000-series railcars from service, following reports that doors were opening during travel; although no systemic problem was located, Metro kept the series out of service for more than a month to address door components that were below acceptable tolerance levels.