SAN FRANCISCO — Facing accusations that Uber executives turned a blind eye to sexual harassment and other corporate misbehavior, the ride-hailing service’s board moved on Sunday to shake up the company’s leadership, ahead of the release this week of an investigation’s findings on its troubled culture.

Uber directors were weighing a three-month leave of absence for Travis Kalanick, the chief executive who built the start-up into a nearly $70 billion entity, according to three people with knowledge of the board’s agenda.

In addition, a representative for Uber’s board said the directors “unanimously voted” to adopt all of the recommendations made in a report by the former attorney general Eric H. Holder Jr., who was retained to investigate the company’s culture. One of the recommendations included the departure of a top lieutenant to Mr. Kalanick, Emil Michael, said the people with knowledge of the board’s agenda, who spoke on the condition of anonymity because the discussions were confidential.

The moves would scale back the involvement of Mr. Kalanick and strip him of an ally, a turnabout for a chief executive who had been hailed as an innovator and a role model. The changes would also further destabilize the leadership at Uber, which has upended the transportation industry worldwide, at a time when rivals are trying to capitalize on the company’s woes.