住友商事
Due to dissatisfaction in performance, the government planned to replace BURI with the maintenance provider of Singapore's MRT, France's RATP, or Sumitomo Corporation back as the maintenance provider. In late-November 2017 it was reported that Sumitomo Corporation will return as the maintenance provider for the line with an agreement to formalize the beginning of talks to facilitate the return of the firm within the later-half of December 2017. The DOTr projects that Sumitomo could work with the line again by around October–December 2018.