In March 2015, the ship was brought to Vigor Industrial's dry dock in Portland, Oregon for maintenance, including repairs to the Azipod units. During the refit, maintenance was performed on its bow thrusters and stabilizers, as well as the Azipod units, ballast and bilge piping were replaced, a low-resistance silicone paint aimed at increasing fuel efficiency was applied to the hull, and the release mechanisms for the lifeboat tenders were upgraded. The "Norwegian Star"'s dining and entertainment spaces were also renovated and digital signage, first introduced on the "Norwegian Breakaway", was installed.