This is what I read that made me say that:
Determining the root cause of a spacecraft issue, however, is not a perfect science.
And even if the issues were well understood, the Starliner team had to face the fact that it would never get to inspect the propulsion system on the actual vehicle in space. It was impossible to survey the problem as the Starliner sat attached to the space station.
What’s more, the unit that houses the troubled RCS thrusters and the helium leaks — called the service module — was not intended to survive the trip home. Instead, the service module, which is a cylindrical attachment at the bottom of the crew cabin, is designed to be ejected and disposed of on the way back to Earth. And it will do just that on this mission.