On December 31, 2016, a "Washington Post" article reported that some residents in DC's Petworth neighborhood were noticing increased noise and vibration levels attributed to the heavier, steel-bodied 7000-series trains. According to the article, Metro engineers conducted initial field tests and noted only "negligible vibration levels." Metro spokesman Richard L. Jordan stated: "Metro is in the process of bringing in third-party engineers to conduct additional tests before we make a final determination." A March 3, 2017 report from WAMU noted that some residents in North Michigan Park and Southwest Waterfront were also experiencing increased noise and vibrations since the 7000-series trains entered service on the Green Line. The same WAMU report stated that Metro has hired the California-based company Wilson Ihrig to conduct "field testing in selected homes."