What was the initial propulsion issue detected in the Starliner RCS thrusters en route to the ISS?

Answer

Five of the 28 maneuvering thrusters failed, though four were recovered.

During the journey to the International Space Station, five of the 28 Reaction Control System (RCS) thrusters experienced failures, although mission control successfully restored four of them before docking.

What was the initial propulsion issue detected in the Starliner RCS thrusters en route to the ISS?

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