A previously undisclosed issue with the Navy’s newest and most advanced aircraft carrier, the USS Gerald R. Ford, forced it to return to port during shakedown testing in January, the branch admitted this week.

For the second time, an issue with the carrier, which cost just short of $13 billion to build, has raised questions about the platform’s propulsion system — this time, the revelation comes amid calls from Navy officials to expand carrier construction efforts to double the current order of forthcoming Ford class carriers. Building two carriers at once could result in a significant reduction in total cost while helping to expedite an ongoing effort to grow the fleet.

According to a statement made by Naval Sea Systems Command, “an out of specification condition” arose in the Ford’s propulsion system during a shakedown cruise in January that was identified when ship engineers noticed that the main thrust bearing was registering temperatures 92 degrees Fahrenheit higher than the bearing’s “temperature setpoint.”

According to the Navy’s investigation, the issue was not caused by improper or excessive use of the component, but rather is the result of a “manufacturing defect.” Further complicating matters, that same defect is said to affect “the same component” located in other parts of the propulsion system.