Boeing’s to-do list is getting longer.

Before the scheduled return of the 737 Max this summer, the aircraft manufacturer plans to separate wire bundles in the jet to assure regulators about the plane’s safety, according to a source familiar with the company’s plans who was not authorized to speak publicly about them.

The wire bundles have raised concerns because they could, in rare circumstances, cause a short circuit and possibly lead to a catastrophic failure. Boeing has argued privately to regulators that the likelihood of such a failure is remote.

Boeing had hoped to avoid having to uncover and separate the wiring, but concluded that global regulators’ insistence on it might further delay the Max’s return, the source said. Boeing could officially notify the Federal Aviation Administration of its plans as soon as this week.

The Max was grounded a year ago after it was involved in two crashes that killed a total of 346 people. The wire bundles were not implicated in those accidents, which have been linked to problems with a software system known as MCAS.